[{"file_date_updated":"2025-12-12T13:12:33Z","citation":{"ama":"Steinmeier P, Hoyer K-P, Lopes Dias NF, Zielke R, Tillmann W, Schaper M. In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion. <i>Crystals</i>. 2025;15(12). doi:<a href=\"https://doi.org/10.3390/cryst15121053\">10.3390/cryst15121053</a>","bibtex":"@article{Steinmeier_Hoyer_Lopes Dias_Zielke_Tillmann_Schaper_2025, title={In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion}, volume={15}, DOI={<a href=\"https://doi.org/10.3390/cryst15121053\">10.3390/cryst15121053</a>}, number={121053}, journal={Crystals}, publisher={MDPI AG}, author={Steinmeier, Paul and Hoyer, Kay-Peter and Lopes Dias, Nelson Filipe and Zielke, Reiner and Tillmann, Wolfgang and Schaper, Mirko}, year={2025} }","mla":"Steinmeier, Paul, et al. “In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion.” <i>Crystals</i>, vol. 15, no. 12, 1053, MDPI AG, 2025, doi:<a href=\"https://doi.org/10.3390/cryst15121053\">10.3390/cryst15121053</a>.","short":"P. Steinmeier, K.-P. Hoyer, N.F. Lopes Dias, R. Zielke, W. Tillmann, M. Schaper, Crystals 15 (2025).","chicago":"Steinmeier, Paul, Kay-Peter Hoyer, Nelson Filipe Lopes Dias, Reiner Zielke, Wolfgang Tillmann, and Mirko Schaper. “In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion.” <i>Crystals</i> 15, no. 12 (2025). <a href=\"https://doi.org/10.3390/cryst15121053\">https://doi.org/10.3390/cryst15121053</a>.","apa":"Steinmeier, P., Hoyer, K.-P., Lopes Dias, N. F., Zielke, R., Tillmann, W., &#38; Schaper, M. (2025). In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion. <i>Crystals</i>, <i>15</i>(12), Article 1053. <a href=\"https://doi.org/10.3390/cryst15121053\">https://doi.org/10.3390/cryst15121053</a>","ieee":"P. Steinmeier, K.-P. Hoyer, N. F. Lopes Dias, R. Zielke, W. Tillmann, and M. Schaper, “In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion,” <i>Crystals</i>, vol. 15, no. 12, Art. no. 1053, 2025, doi: <a href=\"https://doi.org/10.3390/cryst15121053\">10.3390/cryst15121053</a>."},"quality_controlled":"1","oa":"1","status":"public","has_accepted_license":"1","_id":"63072","funded_apc":"1","publisher":"MDPI AG","ddc":["620"],"user_id":"69776","volume":15,"issue":"12","publication":"Crystals","abstract":[{"lang":"eng","text":"<jats:p>Titanium alloys are widely employed for biomedical implants due to their high strength, biocompatibility, and corrosion resistance, yet their lack of intrinsic antibacterial activity remains a major limitation. Incorporating copper, an antibacterial and β-stabilising element, offers a promising strategy to enhance implant performance. This study investigates Ti-6Al-7Nb modified with 1–9 wt.% Cu via in situ alloying during metal-based laser powder bed fusion (PBF-LB/M), with the aim of assessing processability, microstructural evolution, and mechanical properties. Highly dense samples (&gt;99.9%) were produced across all Cu levels, though chemical homogeneity strongly depended on processing parameters. Increasing Cu content promoted β-phase stabilisation, Ti2Cu precipitation, and pronounced grain refinement. Hardness and yield strength increased nearly linearly with Cu addition, while ductility decreased sharply at ≥5 wt.% Cu due to intermetallic formation, hot cracking, and brittle fracture. These results illustrate both the opportunities and constraints of rapid alloy screening via PBF-LB/M. Overall, moderate Cu additions of 1–3 wt.% provide the most favourable balance between mechanical performance, manufacturability, and potential antibacterial functionality. These findings provide a clear guideline for the design of Cu-functionalised titanium implants and demonstrate the efficiency of in situ alloy screening for accelerated materials development.</jats:p>"}],"file":[{"creator":"paulstei","date_created":"2025-12-12T13:12:33Z","relation":"main_file","date_updated":"2025-12-12T13:12:33Z","file_name":"crystals-15-01053.pdf","file_size":20716652,"access_level":"closed","file_id":"63073","content_type":"application/pdf","success":1}],"date_created":"2025-12-12T13:11:59Z","keyword":["Biomaterial","In Situ Alloying","Titanium","Additive Manufacturing"],"type":"journal_article","department":[{"_id":"158"},{"_id":"321"}],"title":"In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion","year":"2025","publication_identifier":{"issn":["2073-4352"]},"author":[{"last_name":"Steinmeier","first_name":"Paul","full_name":"Steinmeier, Paul"},{"full_name":"Hoyer, Kay-Peter","first_name":"Kay-Peter","last_name":"Hoyer"},{"full_name":"Lopes Dias, Nelson Filipe","last_name":"Lopes Dias","first_name":"Nelson Filipe"},{"first_name":"Reiner","last_name":"Zielke","full_name":"Zielke, Reiner"},{"first_name":"Wolfgang","last_name":"Tillmann","full_name":"Tillmann, Wolfgang"},{"full_name":"Schaper, Mirko","first_name":"Mirko","last_name":"Schaper"}],"date_updated":"2025-12-12T14:02:13Z","publication_status":"published","intvolume":"        15","article_type":"original","main_file_link":[{"open_access":"1","url":"https://doi.org/10.3390/cryst15121053"}],"article_number":"1053","language":[{"iso":"eng"}],"doi":"10.3390/cryst15121053"},{"date_updated":"2026-05-21T06:36:29Z","publication_status":"published","intvolume":"        15","title":"Influence of the Etching Material Deposition Rate and Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As Layers via Local Droplet Epitaxy","year":"2025","author":[{"first_name":"Dennis","last_name":"Deutsch","full_name":"Deutsch, Dennis","id":"23489"},{"first_name":"Dirk","last_name":"Reuter","full_name":"Reuter, Dirk","id":"37763"}],"publication_identifier":{"issn":["2073-4352"]},"doi":"10.3390/cryst15110913","article_number":"913","language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"<jats:p>Local droplet etching and subsequent refilling enables the fabrication of highly symmetric quantum dots with low fine structure splitting, suitable for generating polarization entangled photons. While well established in GaAs/AlxGa1−xAs, this approach does not yield emission in the telecom bands required for low loss fiber-based quantum communication. To achieve emission at 1.55 μm, local droplet etching must be adapted to alternative material platforms such as InP. Here, we systematically investigate how the etching material deposition rate and etching time influence nanohole morphology in In0.52Al0.48As layers lattice-matched to InP. In the first experiment, InAl was deposited at fluxes of 0.2–4.0 Å s−1 at Tetch = 350 °C and 460 °C. Lower fluxes produced nanoholes with lower density and larger ring diameters, indicating fewer and larger initial droplets, consistent with scaling theory. The average nanohole diameter decreased monotonically with increasing flux, whereas the average depth showed no clear dependence on flux. In the second experiment, etching times of 30–600 s were tested for InAl, In, and Al droplets. Average nanohole diameters remained constant for Al across all etching times, but decreased for In and InAl with increasing etching time, suggesting sidewall redeposition during etching. For all droplet types, depths peaked at intermediate times and decreased for prolonged etching, consistent with material diffusion into the nanohole after droplet consumption.</jats:p>"}],"publication":"Crystals","issue":"11","type":"journal_article","department":[{"_id":"15"},{"_id":"230"}],"date_created":"2026-05-21T06:35:35Z","status":"public","user_id":"42514","volume":15,"_id":"65669","publisher":"MDPI AG","citation":{"short":"D. Deutsch, D. Reuter, Crystals 15 (2025).","chicago":"Deutsch, Dennis, and Dirk Reuter. “Influence of the Etching Material Deposition Rate and Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As Layers via Local Droplet Epitaxy.” <i>Crystals</i> 15, no. 11 (2025). <a href=\"https://doi.org/10.3390/cryst15110913\">https://doi.org/10.3390/cryst15110913</a>.","apa":"Deutsch, D., &#38; Reuter, D. (2025). Influence of the Etching Material Deposition Rate and Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As Layers via Local Droplet Epitaxy. <i>Crystals</i>, <i>15</i>(11), Article 913. <a href=\"https://doi.org/10.3390/cryst15110913\">https://doi.org/10.3390/cryst15110913</a>","ieee":"D. Deutsch and D. Reuter, “Influence of the Etching Material Deposition Rate and Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As Layers via Local Droplet Epitaxy,” <i>Crystals</i>, vol. 15, no. 11, Art. no. 913, 2025, doi: <a href=\"https://doi.org/10.3390/cryst15110913\">10.3390/cryst15110913</a>.","ama":"Deutsch D, Reuter D. Influence of the Etching Material Deposition Rate and Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As Layers via Local Droplet Epitaxy. <i>Crystals</i>. 2025;15(11). doi:<a href=\"https://doi.org/10.3390/cryst15110913\">10.3390/cryst15110913</a>","bibtex":"@article{Deutsch_Reuter_2025, title={Influence of the Etching Material Deposition Rate and Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As Layers via Local Droplet Epitaxy}, volume={15}, DOI={<a href=\"https://doi.org/10.3390/cryst15110913\">10.3390/cryst15110913</a>}, number={11913}, journal={Crystals}, publisher={MDPI AG}, author={Deutsch, Dennis and Reuter, Dirk}, year={2025} }","mla":"Deutsch, Dennis, and Dirk Reuter. “Influence of the Etching Material Deposition Rate and Annealing Time on Nanohole Morphology Etched into InP/In0.52Al0.48As Layers via Local Droplet Epitaxy.” <i>Crystals</i>, vol. 15, no. 11, 913, MDPI AG, 2025, doi:<a href=\"https://doi.org/10.3390/cryst15110913\">10.3390/cryst15110913</a>."}},{"author":[{"full_name":"Milaege, Dennis","first_name":"Dennis","last_name":"Milaege","id":"35461"},{"full_name":"Eschemann, Niklas","last_name":"Eschemann","first_name":"Niklas"},{"id":"48411","last_name":"Hoyer","first_name":"Kay-Peter","full_name":"Hoyer, Kay-Peter"},{"full_name":"Schaper, Mirko","last_name":"Schaper","first_name":"Mirko","id":"43720"}],"publication_identifier":{"issn":["2073-4352"]},"title":"Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion","year":"2024","intvolume":"        14","date_updated":"2024-03-22T14:22:36Z","publication_status":"published","language":[{"iso":"eng"}],"article_number":"117","doi":"10.3390/cryst14020117","publication":"Crystals","issue":"2","abstract":[{"text":"<jats:p>Through tailoring the geometry and design of biomaterials, additive manufacturing is revolutionizing the production of metallic patient-specific implants, e.g., the Ti-6Al-7Nb alloy. Unfortunately, studies investigating this alloy showed that additively produced samples exhibit anisotropic microstructures. This anisotropy compromises the mechanical properties and complicates the loading state in the implant. Moreover, the minimum requirements as specified per designated standards such as ISO 5832-11 are not met. The remedy to this problem is performing a conventional heat treatment. As this route requires energy, infrastructure, labor, and expertise, which in turn mean time and money, many of the additive manufacturing benefits are negated. Thus, the goal of this work was to achieve better isotropy by applying only adapted additive manufacturing process parameters, specifically focusing on the build orientations. In this work, samples orientated in 90°, 45°, and 0° directions relative to the building platform were manufactured and tested. These tests included mechanical (tensile and fatigue tests) as well as microstructural analyses (SEM and EBSD). Subsequently, the results of these tests such as fractography were correlated with the acquired mechanical properties. These showed that 90°-aligned samples performed best under fatigue load and that all requirements specified by the standard regarding monotonic load were met.</jats:p>","lang":"eng"}],"date_created":"2024-03-22T13:46:37Z","department":[{"_id":"158"},{"_id":"321"}],"keyword":["Inorganic Chemistry","Condensed Matter Physics","General Materials Science","General Chemical Engineering"],"type":"journal_article","status":"public","_id":"52738","publisher":"MDPI AG","volume":14,"user_id":"35461","citation":{"ama":"Milaege D, Eschemann N, Hoyer K-P, Schaper M. Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion. <i>Crystals</i>. 2024;14(2). doi:<a href=\"https://doi.org/10.3390/cryst14020117\">10.3390/cryst14020117</a>","bibtex":"@article{Milaege_Eschemann_Hoyer_Schaper_2024, title={Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion}, volume={14}, DOI={<a href=\"https://doi.org/10.3390/cryst14020117\">10.3390/cryst14020117</a>}, number={2117}, journal={Crystals}, publisher={MDPI AG}, author={Milaege, Dennis and Eschemann, Niklas and Hoyer, Kay-Peter and Schaper, Mirko}, year={2024} }","mla":"Milaege, Dennis, et al. “Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion.” <i>Crystals</i>, vol. 14, no. 2, 117, MDPI AG, 2024, doi:<a href=\"https://doi.org/10.3390/cryst14020117\">10.3390/cryst14020117</a>.","short":"D. Milaege, N. Eschemann, K.-P. Hoyer, M. Schaper, Crystals 14 (2024).","chicago":"Milaege, Dennis, Niklas Eschemann, Kay-Peter Hoyer, and Mirko Schaper. “Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion.” <i>Crystals</i> 14, no. 2 (2024). <a href=\"https://doi.org/10.3390/cryst14020117\">https://doi.org/10.3390/cryst14020117</a>.","apa":"Milaege, D., Eschemann, N., Hoyer, K.-P., &#38; Schaper, M. (2024). Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion. <i>Crystals</i>, <i>14</i>(2), Article 117. <a href=\"https://doi.org/10.3390/cryst14020117\">https://doi.org/10.3390/cryst14020117</a>","ieee":"D. Milaege, N. Eschemann, K.-P. Hoyer, and M. Schaper, “Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion,” <i>Crystals</i>, vol. 14, no. 2, Art. no. 117, 2024, doi: <a href=\"https://doi.org/10.3390/cryst14020117\">10.3390/cryst14020117</a>."},"quality_controlled":"1"},{"quality_controlled":"1","file_date_updated":"2024-11-28T08:52:48Z","citation":{"chicago":"Lehnert, Dennis, Christian Bödger, Philipp Pabel, Claus Scheidemann, Tobias Hemsel, Stefan Gnaase, David Kostka, and Thomas Tröster. “The Influence of Ultrasonic Irradiation of a 316L Weld Pool Produced by DED on the Mechanical Properties of the Produced Component.” <i>Crystals</i> 14, no. 11 (2024). <a href=\"https://doi.org/10.3390/cryst14111001\">https://doi.org/10.3390/cryst14111001</a>.","short":"D. Lehnert, C. Bödger, P. Pabel, C. Scheidemann, T. Hemsel, S. Gnaase, D. Kostka, T. Tröster, Crystals 14 (2024).","ieee":"D. Lehnert <i>et al.</i>, “The Influence of Ultrasonic Irradiation of a 316L Weld Pool Produced by DED on the Mechanical Properties of the Produced Component,” <i>Crystals</i>, vol. 14, no. 11, Art. no. 1001, 2024, doi: <a href=\"https://doi.org/10.3390/cryst14111001\">10.3390/cryst14111001</a>.","apa":"Lehnert, D., Bödger, C., Pabel, P., Scheidemann, C., Hemsel, T., Gnaase, S., Kostka, D., &#38; Tröster, T. (2024). The Influence of Ultrasonic Irradiation of a 316L Weld Pool Produced by DED on the Mechanical Properties of the Produced Component. <i>Crystals</i>, <i>14</i>(11), Article 1001. <a href=\"https://doi.org/10.3390/cryst14111001\">https://doi.org/10.3390/cryst14111001</a>","bibtex":"@article{Lehnert_Bödger_Pabel_Scheidemann_Hemsel_Gnaase_Kostka_Tröster_2024, title={The Influence of Ultrasonic Irradiation of a 316L Weld Pool Produced by DED on the Mechanical Properties of the Produced Component}, volume={14}, DOI={<a href=\"https://doi.org/10.3390/cryst14111001\">10.3390/cryst14111001</a>}, number={111001}, journal={Crystals}, publisher={MDPI AG}, author={Lehnert, Dennis and Bödger, Christian and Pabel, Philipp and Scheidemann, Claus and Hemsel, Tobias and Gnaase, Stefan and Kostka, David and Tröster, Thomas}, year={2024} }","ama":"Lehnert D, Bödger C, Pabel P, et al. The Influence of Ultrasonic Irradiation of a 316L Weld Pool Produced by DED on the Mechanical Properties of the Produced Component. <i>Crystals</i>. 2024;14(11). doi:<a href=\"https://doi.org/10.3390/cryst14111001\">10.3390/cryst14111001</a>","mla":"Lehnert, Dennis, et al. “The Influence of Ultrasonic Irradiation of a 316L Weld Pool Produced by DED on the Mechanical Properties of the Produced Component.” <i>Crystals</i>, vol. 14, no. 11, 1001, MDPI AG, 2024, doi:<a href=\"https://doi.org/10.3390/cryst14111001\">10.3390/cryst14111001</a>."},"has_accepted_license":"1","status":"public","ddc":["670"],"user_id":"93904","volume":14,"_id":"57467","publisher":"MDPI AG","abstract":[{"text":"<jats:p>Additive manufacturing of metallic components often results in the formation of columnar grain structures aligned along the build direction. These elongated grains can introduce anisotropy, negatively impacting the mechanical properties of the components. This study aimed to achieve controlled solidification with a fine-grained microstructure to enhance the mechanical performance of printed parts. Stainless steel 316L was used as the test material. High-intensity ultrasound was applied during the direct energy deposition (DED) process to inhibit the formation of columnar grains. The investigation emphasized the importance of amplitude changes of the ultrasound wave as the system’s geometry continuously evolves with the addition of multiple layers and assessed how these changes influence the grain size and distribution. Initial tests revealed significant amplitude fluctuations during layer deposition, highlighting the impact of layer deposition on process uniformity. The mechanical results demonstrated that the application of ultrasound effectively refined the grain structure, leading to a 15% increase in tensile strength compared to conventionally additively manufactured samples.</jats:p>","lang":"eng"}],"issue":"11","publication":"Crystals","type":"journal_article","department":[{"_id":"149"},{"_id":"321"},{"_id":"9"}],"file":[{"date_updated":"2024-11-28T08:52:48Z","relation":"main_file","access_level":"closed","file_size":5779744,"file_name":"crystals-14-01001-v2 (4).pdf","success":1,"content_type":"application/pdf","file_id":"57470","creator":"dlehnert","date_created":"2024-11-28T08:52:48Z"}],"date_created":"2024-11-28T08:45:06Z","date_updated":"2026-02-23T08:07:37Z","publication_status":"published","intvolume":"        14","title":"The Influence of Ultrasonic Irradiation of a 316L Weld Pool Produced by DED on the Mechanical Properties of the Produced Component","year":"2024","author":[{"full_name":"Lehnert, Dennis","first_name":"Dennis","last_name":"Lehnert","id":"90491"},{"id":"93904","full_name":"Bödger, Christian","last_name":"Bödger","first_name":"Christian"},{"full_name":"Pabel, Philipp","last_name":"Pabel","first_name":"Philipp","id":"67374"},{"id":"38259","first_name":"Claus","last_name":"Scheidemann","full_name":"Scheidemann, Claus"},{"last_name":"Hemsel","first_name":"Tobias","full_name":"Hemsel, Tobias","id":"210"},{"id":"25730","first_name":"Stefan","last_name":"Gnaase","full_name":"Gnaase, Stefan"},{"first_name":"David","last_name":"Kostka","full_name":"Kostka, David"},{"id":"553","first_name":"Thomas","last_name":"Tröster","full_name":"Tröster, Thomas"}],"publication_identifier":{"issn":["2073-4352"]},"doi":"10.3390/cryst14111001","article_number":"1001","language":[{"iso":"eng"}]},{"status":"public","volume":13,"user_id":"22501","_id":"47997","funded_apc":"1","publisher":"MDPI AG","project":[{"name":"TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)","grant_number":"231447078","_id":"168"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","grant_number":"PROFILNRW-2020-067","_id":"266"}],"quality_controlled":"1","citation":{"mla":"Neufeld, Sergej, et al. “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” <i>Crystals</i>, vol. 13, no. 10, 1423, MDPI AG, 2023, doi:<a href=\"https://doi.org/10.3390/cryst13101423\">10.3390/cryst13101423</a>.","ama":"Neufeld S, Gerstmann U, Padberg L, et al. Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family. <i>Crystals</i>. 2023;13(10). doi:<a href=\"https://doi.org/10.3390/cryst13101423\">10.3390/cryst13101423</a>","bibtex":"@article{Neufeld_Gerstmann_Padberg_Eigner_Berth_Silberhorn_Eng_Schmidt_Rüsing_2023, title={Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family}, volume={13}, DOI={<a href=\"https://doi.org/10.3390/cryst13101423\">10.3390/cryst13101423</a>}, number={101423}, journal={Crystals}, publisher={MDPI AG}, author={Neufeld, Sergej and Gerstmann, Uwe and Padberg, Laura and Eigner, Christof and Berth, Gerhard and Silberhorn, Christine and Eng, Lukas M. and Schmidt, Wolf Gero and Rüsing, Michael}, year={2023} }","apa":"Neufeld, S., Gerstmann, U., Padberg, L., Eigner, C., Berth, G., Silberhorn, C., Eng, L. M., Schmidt, W. G., &#38; Rüsing, M. (2023). Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family. <i>Crystals</i>, <i>13</i>(10), Article 1423. <a href=\"https://doi.org/10.3390/cryst13101423\">https://doi.org/10.3390/cryst13101423</a>","ieee":"S. Neufeld <i>et al.</i>, “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family,” <i>Crystals</i>, vol. 13, no. 10, Art. no. 1423, 2023, doi: <a href=\"https://doi.org/10.3390/cryst13101423\">10.3390/cryst13101423</a>.","chicago":"Neufeld, Sergej, Uwe Gerstmann, Laura Padberg, Christof Eigner, Gerhard Berth, Christine Silberhorn, Lukas M. Eng, Wolf Gero Schmidt, and Michael Rüsing. “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” <i>Crystals</i> 13, no. 10 (2023). <a href=\"https://doi.org/10.3390/cryst13101423\">https://doi.org/10.3390/cryst13101423</a>.","short":"S. Neufeld, U. Gerstmann, L. Padberg, C. Eigner, G. Berth, C. Silberhorn, L.M. Eng, W.G. Schmidt, M. Rüsing, Crystals 13 (2023)."},"oa":"1","intvolume":"        13","date_updated":"2023-10-11T09:15:58Z","publication_status":"published","publication_identifier":{"issn":["2073-4352"]},"author":[{"first_name":"Sergej","last_name":"Neufeld","full_name":"Neufeld, Sergej"},{"id":"171","first_name":"Uwe","last_name":"Gerstmann","orcid":"0000-0002-4476-223X","full_name":"Gerstmann, Uwe"},{"last_name":"Padberg","first_name":"Laura","full_name":"Padberg, Laura","id":"40300"},{"id":"13244","first_name":"Christof","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","full_name":"Eigner, Christof"},{"id":"53","last_name":"Berth","first_name":"Gerhard","full_name":"Berth, Gerhard"},{"id":"26263","last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."},{"full_name":"Schmidt, Wolf Gero","last_name":"Schmidt","orcid":"0000-0002-2717-5076","first_name":"Wolf Gero","id":"468"},{"last_name":"Rüsing","orcid":"0000-0003-4682-4577","first_name":"Michael","full_name":"Rüsing, Michael","id":"22501"}],"year":"2023","title":"Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family","doi":"10.3390/cryst13101423","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://doi.org/10.3390/cryst13101423","open_access":"1"}],"article_number":"1423","abstract":[{"text":"The crystal family of potassium titanyl phosphate (KTiOPO4) is a promising material group for applications in quantum and nonlinear optics. The fabrication of low-loss optical waveguides, as well as high-grade periodically poled ferroelectric domain structures, requires a profound understanding of the material properties and crystal structure. In this regard, Raman spectroscopy offers the possibility to study and visualize domain structures, strain, defects, and the local stoichiometry, which are all factors impacting device performance. However, the accurate interpretation of Raman spectra and their changes with respect to extrinsic and intrinsic defects requires a thorough assignment of the Raman modes to their respective crystal features, which to date is only partly conducted based on phenomenological modelling. To address this issue, we calculated the phonon spectra of potassium titanyl phosphate and the related compounds rubidium titanyl phosphate (RbTiOPO4) and potassium titanyl arsenate (KTiOAsO4) based on density functional theory and compared them with experimental data. Overall, this allows us to assign various spectral features to eigenmodes of lattice substructures with improved detail compared to previous assignments. Nevertheless, the analysis also shows that not all features of the spectra can unambigiously be explained yet. A possible explanation might be that defects or long range fields not included in the modeling play a crucial rule for the resulting Raman spectrum. In conclusion, this work provides an improved foundation into the vibrational properties in the KTiOPO4 material family.","lang":"eng"}],"issue":"10","publication":"Crystals","department":[{"_id":"169"}],"type":"journal_article","keyword":["Inorganic Chemistry","Condensed Matter Physics","General Materials Science","General Chemical Engineering"],"date_created":"2023-10-11T09:10:53Z"},{"citation":{"short":"S. Pramanik, D. Milaege, M. Hein, K.-P. Hoyer, M. Schaper, Crystals 13 (2023).","chicago":"Pramanik, Sudipta, Dennis Milaege, Maxwell Hein, Kay-Peter Hoyer, and Mirko Schaper. “Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach.” <i>Crystals</i> 13, no. 11 (2023). <a href=\"https://doi.org/10.3390/cryst13111592\">https://doi.org/10.3390/cryst13111592</a>.","ieee":"S. Pramanik, D. Milaege, M. Hein, K.-P. Hoyer, and M. Schaper, “Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach,” <i>Crystals</i>, vol. 13, no. 11, Art. no. 1592, 2023, doi: <a href=\"https://doi.org/10.3390/cryst13111592\">10.3390/cryst13111592</a>.","apa":"Pramanik, S., Milaege, D., Hein, M., Hoyer, K.-P., &#38; Schaper, M. (2023). Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach. <i>Crystals</i>, <i>13</i>(11), Article 1592. <a href=\"https://doi.org/10.3390/cryst13111592\">https://doi.org/10.3390/cryst13111592</a>","bibtex":"@article{Pramanik_Milaege_Hein_Hoyer_Schaper_2023, title={Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach}, volume={13}, DOI={<a href=\"https://doi.org/10.3390/cryst13111592\">10.3390/cryst13111592</a>}, number={111592}, journal={Crystals}, publisher={MDPI AG}, author={Pramanik, Sudipta and Milaege, Dennis and Hein, Maxwell and Hoyer, Kay-Peter and Schaper, Mirko}, year={2023} }","ama":"Pramanik S, Milaege D, Hein M, Hoyer K-P, Schaper M. Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach. <i>Crystals</i>. 2023;13(11). doi:<a href=\"https://doi.org/10.3390/cryst13111592\">10.3390/cryst13111592</a>","mla":"Pramanik, Sudipta, et al. “Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach.” <i>Crystals</i>, vol. 13, no. 11, 1592, MDPI AG, 2023, doi:<a href=\"https://doi.org/10.3390/cryst13111592\">10.3390/cryst13111592</a>."},"quality_controlled":"1","_id":"49107","publisher":"MDPI AG","user_id":"48411","volume":13,"status":"public","date_created":"2023-11-21T15:29:49Z","type":"journal_article","keyword":["Inorganic Chemistry","Condensed Matter Physics","General Materials Science","General Chemical Engineering"],"department":[{"_id":"9"},{"_id":"158"}],"publication":"Crystals","issue":"11","abstract":[{"lang":"eng","text":"<jats:p>The effect of plaque deposition (atherosclerosis) on blood flow behaviour is investigated via computational fluid dynamics and structural mechanics simulations. To mitigate the narrowing of coronary artery atherosclerosis (stenosis), the computational modelling of auxetic and non-auxetic stents was performed in this study to minimise or even avoid these deposition agents in the future. Computational modelling was performed in unrestricted (open) conditions and restricted (in an artery) conditions. Finally, stent designs were produced by additive manufacturing, and mechanical testing of the stents was undertaken. Auxetic stent 1 and auxetic stent 2 exhibit very little foreshortening and radial recoil in unrestricted deployment conditions compared to non-auxetic stent 3. However, stent 2 shows structural instability (strut failure) during unrestricted deployment conditions. For the restricted deployment condition, stent 1 shows a higher radial recoil compared to stent 3. In the tensile test simulations, short elongation for stent 1 due to strut failure is demonstrated, whereas no structural instability is noticed for stent 2 and stent 3 until 0.5 (mm/mm) strain. The as-built samples show a significant thickening of the struts of the stents resulting in short elongations during tensile testing compared to the simulations (stent 2 and stent 3). A modelling framework for the stent deployment system that enables the selection of appropriate stent designs before in vivo testing is required. This leads to the acceleration of the development process and a reduction in time, resulting in less material wastage. The modelling framework shall be useful for doctors designing patient-specific stents.</jats:p>"}],"article_number":"1592","language":[{"iso":"eng"}],"doi":"10.3390/cryst13111592","year":"2023","title":"Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach","publication_identifier":{"issn":["2073-4352"]},"author":[{"full_name":"Pramanik, Sudipta","last_name":"Pramanik","first_name":"Sudipta"},{"full_name":"Milaege, Dennis","last_name":"Milaege","first_name":"Dennis"},{"id":"52771","first_name":"Maxwell","orcid":"0000-0002-3732-2236","last_name":"Hein","full_name":"Hein, Maxwell"},{"full_name":"Hoyer, Kay-Peter","first_name":"Kay-Peter","last_name":"Hoyer","id":"48411"},{"full_name":"Schaper, Mirko","last_name":"Schaper","first_name":"Mirko","id":"43720"}],"publication_status":"published","date_updated":"2023-11-21T15:30:57Z","intvolume":"        13"},{"status":"public","publisher":"MDPI AG","_id":"54852","volume":13,"user_id":"16199","citation":{"chicago":"Neufeld, Sergej, Uwe Gerstmann, Laura Padberg, Christof Eigner, Gerhard Berth, Christine Silberhorn, Lukas M. Eng, Wolf Gero Schmidt, and Michael Rüsing. “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” <i>Crystals</i> 13, no. 10 (2023). <a href=\"https://doi.org/10.3390/cryst13101423\">https://doi.org/10.3390/cryst13101423</a>.","short":"S. Neufeld, U. Gerstmann, L. Padberg, C. Eigner, G. Berth, C. Silberhorn, L.M. Eng, W.G. Schmidt, M. Rüsing, Crystals 13 (2023).","ieee":"S. Neufeld <i>et al.</i>, “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family,” <i>Crystals</i>, vol. 13, no. 10, Art. no. 1423, 2023, doi: <a href=\"https://doi.org/10.3390/cryst13101423\">10.3390/cryst13101423</a>.","apa":"Neufeld, S., Gerstmann, U., Padberg, L., Eigner, C., Berth, G., Silberhorn, C., Eng, L. M., Schmidt, W. G., &#38; Rüsing, M. (2023). Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family. <i>Crystals</i>, <i>13</i>(10), Article 1423. <a href=\"https://doi.org/10.3390/cryst13101423\">https://doi.org/10.3390/cryst13101423</a>","bibtex":"@article{Neufeld_Gerstmann_Padberg_Eigner_Berth_Silberhorn_Eng_Schmidt_Rüsing_2023, title={Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family}, volume={13}, DOI={<a href=\"https://doi.org/10.3390/cryst13101423\">10.3390/cryst13101423</a>}, number={101423}, journal={Crystals}, publisher={MDPI AG}, author={Neufeld, Sergej and Gerstmann, Uwe and Padberg, Laura and Eigner, Christof and Berth, Gerhard and Silberhorn, Christine and Eng, Lukas M. and Schmidt, Wolf Gero and Rüsing, Michael}, year={2023} }","ama":"Neufeld S, Gerstmann U, Padberg L, et al. Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family. <i>Crystals</i>. 2023;13(10). doi:<a href=\"https://doi.org/10.3390/cryst13101423\">10.3390/cryst13101423</a>","mla":"Neufeld, Sergej, et al. “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” <i>Crystals</i>, vol. 13, no. 10, 1423, MDPI AG, 2023, doi:<a href=\"https://doi.org/10.3390/cryst13101423\">10.3390/cryst13101423</a>."},"project":[{"name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53","grant_number":"231447078"}],"author":[{"first_name":"Sergej","last_name":"Neufeld","full_name":"Neufeld, Sergej"},{"full_name":"Gerstmann, Uwe","orcid":"0000-0002-4476-223X","first_name":"Uwe","last_name":"Gerstmann","id":"171"},{"id":"40300","full_name":"Padberg, Laura","last_name":"Padberg","first_name":"Laura"},{"id":"13244","full_name":"Eigner, Christof","first_name":"Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083"},{"first_name":"Gerhard","last_name":"Berth","full_name":"Berth, Gerhard","id":"53"},{"full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine","id":"26263"},{"last_name":"Eng","first_name":"Lukas M.","full_name":"Eng, Lukas M."},{"orcid":"0000-0002-2717-5076","last_name":"Schmidt","first_name":"Wolf Gero","full_name":"Schmidt, Wolf Gero","id":"468"},{"full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","first_name":"Michael","last_name":"Rüsing","id":"22501"}],"publication_identifier":{"issn":["2073-4352"]},"year":"2023","title":"Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family","intvolume":"        13","publication_status":"published","date_updated":"2024-06-24T06:30:23Z","language":[{"iso":"eng"}],"article_number":"1423","doi":"10.3390/cryst13101423","issue":"10","publication":"Crystals","abstract":[{"lang":"eng","text":"<jats:p>The crystal family of potassium titanyl phosphate (KTiOPO4) is a promising material group for applications in quantum and nonlinear optics. The fabrication of low-loss optical waveguides, as well as high-grade periodically poled ferroelectric domain structures, requires a profound understanding of the material properties and crystal structure. In this regard, Raman spectroscopy offers the possibility to study and visualize domain structures, strain, defects, and the local stoichiometry, which are all factors impacting device performance. However, the accurate interpretation of Raman spectra and their changes with respect to extrinsic and intrinsic defects requires a thorough assignment of the Raman modes to their respective crystal features, which to date is only partly conducted based on phenomenological modelling. To address this issue, we calculated the phonon spectra of potassium titanyl phosphate and the related compounds rubidium titanyl phosphate (RbTiOPO4) and potassium titanyl arsenate (KTiOAsO4) based on density functional theory and compared them with experimental data. Overall, this allows us to assign various spectral features to eigenmodes of lattice substructures with improved detail compared to previous assignments. Nevertheless, the analysis also shows that not all features of the spectra can unambigiously be explained yet. A possible explanation might be that defects or long range fields not included in the modeling play a crucial rule for the resulting Raman spectrum. In conclusion, this work provides an improved foundation into the vibrational properties in the KTiOPO4 material family.</jats:p>"}],"date_created":"2024-06-24T06:15:00Z","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"288"},{"_id":"230"},{"_id":"429"}],"type":"journal_article"},{"title":"Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles","year":"2023","publication_identifier":{"issn":["2073-4352"]},"author":[{"id":"58349","full_name":"Bocchini, Adriana","last_name":"Bocchini","orcid":"0000-0002-2134-3075","first_name":"Adriana"},{"full_name":"Xie, Yingjie","first_name":"Yingjie","last_name":"Xie"},{"last_name":"Schmidt","orcid":"0000-0002-2717-5076","first_name":"Wolf Gero","full_name":"Schmidt, Wolf Gero","id":"468"},{"id":"171","orcid":"0000-0002-4476-223X","first_name":"Uwe","last_name":"Gerstmann","full_name":"Gerstmann, Uwe"}],"publication_status":"published","date_updated":"2024-06-24T06:30:13Z","intvolume":"        14","article_number":"5","language":[{"iso":"eng"}],"doi":"10.3390/cryst14010005","issue":"1","publication":"Crystals","abstract":[{"text":"<jats:p>Batteries based on heavier alkali ions are considered promising candidates to substitute for current Li-based technologies. In this theoretical study, we characterize the structural properties of a novel material, i.e., F-doped RbTiOPO4 (RbTiPO4F, RTP:F), and discuss aspects of its electrochemical performance in Rb-ion batteries (RIBs) using density functional theory (DFT). According to our calculations, RTP:F is expected to retain the so-called KTiOPO4 (KTP)-type structure, with lattice parameters of 13.236 Å, 6.616 Å, and 10.945 Å. Due to the doping with F, the crystal features eight extra electrons per unit cell, whereby each of these electrons is trapped by one of the surrounding Ti atoms in the cell. Notably, the ground state of the system corresponds to a ferromagnetic spin configuration (i.e., S=4). The deintercalation of Rb leads to the oxidation of the Ti atoms in the cell (i.e., from Ti3+ to Ti4+) and to reduced magnetic moments. The material promises interesting electrochemical properties for the cathode: rather high average voltages above 2.8 V and modest volume shrinkages below 13% even in the fully deintercalated case are predicted.</jats:p>","lang":"eng"}],"date_created":"2024-06-24T06:21:04Z","type":"journal_article","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"790"},{"_id":"230"},{"_id":"429"},{"_id":"27"}],"status":"public","_id":"54854","publisher":"MDPI AG","user_id":"16199","volume":14,"citation":{"ieee":"A. Bocchini, Y. Xie, W. G. Schmidt, and U. Gerstmann, “Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles,” <i>Crystals</i>, vol. 14, no. 1, Art. no. 5, 2023, doi: <a href=\"https://doi.org/10.3390/cryst14010005\">10.3390/cryst14010005</a>.","apa":"Bocchini, A., Xie, Y., Schmidt, W. G., &#38; Gerstmann, U. (2023). Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles. <i>Crystals</i>, <i>14</i>(1), Article 5. <a href=\"https://doi.org/10.3390/cryst14010005\">https://doi.org/10.3390/cryst14010005</a>","short":"A. Bocchini, Y. Xie, W.G. Schmidt, U. Gerstmann, Crystals 14 (2023).","chicago":"Bocchini, Adriana, Yingjie Xie, Wolf Gero Schmidt, and Uwe Gerstmann. “Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles.” <i>Crystals</i> 14, no. 1 (2023). <a href=\"https://doi.org/10.3390/cryst14010005\">https://doi.org/10.3390/cryst14010005</a>.","mla":"Bocchini, Adriana, et al. “Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles.” <i>Crystals</i>, vol. 14, no. 1, 5, MDPI AG, 2023, doi:<a href=\"https://doi.org/10.3390/cryst14010005\">10.3390/cryst14010005</a>.","bibtex":"@article{Bocchini_Xie_Schmidt_Gerstmann_2023, title={Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles}, volume={14}, DOI={<a href=\"https://doi.org/10.3390/cryst14010005\">10.3390/cryst14010005</a>}, number={15}, journal={Crystals}, publisher={MDPI AG}, author={Bocchini, Adriana and Xie, Yingjie and Schmidt, Wolf Gero and Gerstmann, Uwe}, year={2023} }","ama":"Bocchini A, Xie Y, Schmidt WG, Gerstmann U. Structural and Electrochemical Properties of F-Doped RbTiOPO4 (RTP:F) Predicted from First Principles. <i>Crystals</i>. 2023;14(1). doi:<a href=\"https://doi.org/10.3390/cryst14010005\">10.3390/cryst14010005</a>"},"project":[{"grant_number":"231447078","_id":"53","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"_id":"166","name":"TRR 142 - A11: TRR 142 - Subproject A11"},{"_id":"168","grant_number":"231447078","name":"TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}]},{"_id":"37200","publisher":"MDPI AG","volume":13,"user_id":"90491","ddc":["670"],"status":"public","citation":{"chicago":"Gnaase, Stefan, Dennis Niggemeyer, Dennis Lehnert, Christian Bödger, and Thomas Tröster. “Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD &#38;amp; L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709.” <i>Crystals</i> 13, no. 2 (2023). <a href=\"https://doi.org/10.3390/cryst13020157\">https://doi.org/10.3390/cryst13020157</a>.","short":"S. Gnaase, D. Niggemeyer, D. Lehnert, C. Bödger, T. Tröster, Crystals 13 (2023).","ieee":"S. Gnaase, D. Niggemeyer, D. Lehnert, C. Bödger, and T. Tröster, “Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD &#38;amp; L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709,” <i>Crystals</i>, vol. 13, no. 2, Art. no. 157, 2023, doi: <a href=\"https://doi.org/10.3390/cryst13020157\">10.3390/cryst13020157</a>.","apa":"Gnaase, S., Niggemeyer, D., Lehnert, D., Bödger, C., &#38; Tröster, T. (2023). Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD &#38;amp; L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709. <i>Crystals</i>, <i>13</i>(2), Article 157. <a href=\"https://doi.org/10.3390/cryst13020157\">https://doi.org/10.3390/cryst13020157</a>","bibtex":"@article{Gnaase_Niggemeyer_Lehnert_Bödger_Tröster_2023, title={Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD &#38;amp; L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709}, volume={13}, DOI={<a href=\"https://doi.org/10.3390/cryst13020157\">10.3390/cryst13020157</a>}, number={2157}, journal={Crystals}, publisher={MDPI AG}, author={Gnaase, Stefan and Niggemeyer, Dennis and Lehnert, Dennis and Bödger, Christian and Tröster, Thomas}, year={2023} }","ama":"Gnaase S, Niggemeyer D, Lehnert D, Bödger C, Tröster T. Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD &#38;amp; L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709. <i>Crystals</i>. 2023;13(2). doi:<a href=\"https://doi.org/10.3390/cryst13020157\">10.3390/cryst13020157</a>","mla":"Gnaase, Stefan, et al. “Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD &#38;amp; L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709.” <i>Crystals</i>, vol. 13, no. 2, 157, MDPI AG, 2023, doi:<a href=\"https://doi.org/10.3390/cryst13020157\">10.3390/cryst13020157</a>."},"file_date_updated":"2024-11-22T15:55:07Z","quality_controlled":"1","language":[{"iso":"eng"}],"article_number":"157","doi":"10.3390/cryst13020157","author":[{"first_name":"Stefan","last_name":"Gnaase","full_name":"Gnaase, Stefan","id":"25730"},{"id":"77214","last_name":"Niggemeyer","first_name":"Dennis","full_name":"Niggemeyer, Dennis"},{"first_name":"Dennis","last_name":"Lehnert","full_name":"Lehnert, Dennis","id":"90491"},{"id":"93904","full_name":"Bödger, Christian","first_name":"Christian","last_name":"Bödger"},{"id":"553","first_name":"Thomas","last_name":"Tröster","full_name":"Tröster, Thomas"}],"publication_identifier":{"issn":["2073-4352"]},"year":"2023","title":"Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD &amp; L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709","article_type":"original","intvolume":"        13","publication_status":"published","date_updated":"2025-03-18T12:45:57Z","date_created":"2023-01-18T05:44:59Z","file":[{"content_type":"application/pdf","success":1,"file_id":"57334","date_updated":"2024-11-22T15:55:07Z","relation":"main_file","file_size":5838834,"access_level":"closed","file_name":"crystals-13-00157.pdf","date_created":"2024-11-22T15:55:07Z","creator":"cboedger"}],"department":[{"_id":"149"},{"_id":"9"},{"_id":"321"}],"keyword":["Inorganic Chemistry","Condensed Matter Physics","General Materials Science","General Chemical Engineering"],"type":"journal_article","publication":"Crystals","issue":"2","abstract":[{"lang":"eng","text":"<jats:p>(1) This work answers the question of whether and to what extent there is a significant difference in mechanical properties when different additive manufacturing processes are applied to the material 1.2709. The Laser-Powder-Bed-Fusion (L-PBF) and Laser-Metal-Deposition (LMD) processes are considered, as they differ fundamentally in the way a part is manufactured. (2) Known process parameters for low-porosity parts were used to fabricate tensile strength specimens. Half of the specimens were heat-treated, and all specimens were tested for mechanical properties in a quasi-static tensile test. In addition, the material hardness was determined. (3) It was found that, firstly, heat treatment resulted in a sharp increase in mechanical properties such as hardness, elastic modulus, yield strength and ultimate strength. In addition to the increase in these properties, the elongation at break also decreases significantly after heat treatment. The choice of process, on the other hand, does not give either process a clear advantage in terms of mechanical properties but shows that it is necessary to consider the essential mechanical properties for a desired application.</jats:p>"}]},{"intvolume":"        12","date_updated":"2023-04-21T11:07:11Z","publication_identifier":{"issn":["2073-4352"]},"author":[{"id":"40300","full_name":"Padberg, Laura","last_name":"Padberg","first_name":"Laura"},{"full_name":"Quiring, Viktor","first_name":"Viktor","last_name":"Quiring"},{"orcid":"0000-0002-2134-3075","first_name":"Adriana","last_name":"Bocchini","full_name":"Bocchini, Adriana","id":"58349"},{"orcid":"0000-0001-5718-358X","first_name":"Matteo","last_name":"Santandrea","full_name":"Santandrea, Matteo","id":"55095"},{"id":"171","full_name":"Gerstmann, Uwe","first_name":"Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann"},{"id":"468","full_name":"Schmidt, Wolf Gero","orcid":"0000-0002-2717-5076","first_name":"Wolf Gero","last_name":"Schmidt"},{"id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine"},{"id":"13244","full_name":"Eigner, Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","first_name":"Christof"}],"title":"DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking","year":"2022","doi":"10.3390/cryst12101359","language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1"}],"abstract":[{"text":"We study the DC conductivity in potassium titanyl phosphate (KTiOPO4, KTP) and its isomorphs KTiOAsO4 (KTA) and Rb1%K99%TiOPO4 (RKTP) and introduce a method by which to reduce the overall ionic conductivity in KTP by a potassium nitrate treatment. Furthermore, we create so-called gray tracking in KTP and investigate the ionic conductivity in theses areas. A local unintended reduction of the ionic conductivity is observed in the gray-tracked regions, which also induce additional optical absorption in the material. We show that a thermal treatment in an oxygen-rich atmosphere removes the gray tracking and brings the ionic conductivity as well as the optical transmission back to the original level. These studies can help to choose the best material and treatment for specific applications.","lang":"eng"}],"publication":"Crystals","department":[{"_id":"15"},{"_id":"288"},{"_id":"623"},{"_id":"170"},{"_id":"295"},{"_id":"230"},{"_id":"429"},{"_id":"35"},{"_id":"790"}],"type":"journal_article","date_created":"2022-09-26T13:12:48Z","status":"public","volume":12,"user_id":"171","_id":"33484","page":"1359","project":[{"name":"TRR 142: TRR 142","_id":"53"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"},{"_id":"168","name":"TRR 142 - B07: TRR 142 - Subproject B07"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"name":"TRR 142 - A11: TRR 142 - Subproject A11","_id":"166"}],"citation":{"ieee":"L. Padberg <i>et al.</i>, “DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking,” <i>Crystals</i>, vol. 12, p. 1359, 2022, doi: <a href=\"https://doi.org/10.3390/cryst12101359\">10.3390/cryst12101359</a>.","apa":"Padberg, L., Quiring, V., Bocchini, A., Santandrea, M., Gerstmann, U., Schmidt, W. G., Silberhorn, C., &#38; Eigner, C. (2022). DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking. <i>Crystals</i>, <i>12</i>, 1359. <a href=\"https://doi.org/10.3390/cryst12101359\">https://doi.org/10.3390/cryst12101359</a>","chicago":"Padberg, Laura, Viktor Quiring, Adriana Bocchini, Matteo Santandrea, Uwe Gerstmann, Wolf Gero Schmidt, Christine Silberhorn, and Christof Eigner. “DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking.” <i>Crystals</i> 12 (2022): 1359. <a href=\"https://doi.org/10.3390/cryst12101359\">https://doi.org/10.3390/cryst12101359</a>.","short":"L. Padberg, V. Quiring, A. Bocchini, M. Santandrea, U. Gerstmann, W.G. Schmidt, C. Silberhorn, C. Eigner, Crystals 12 (2022) 1359.","mla":"Padberg, Laura, et al. “DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking.” <i>Crystals</i>, vol. 12, 2022, p. 1359, doi:<a href=\"https://doi.org/10.3390/cryst12101359\">10.3390/cryst12101359</a>.","bibtex":"@article{Padberg_Quiring_Bocchini_Santandrea_Gerstmann_Schmidt_Silberhorn_Eigner_2022, title={DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking}, volume={12}, DOI={<a href=\"https://doi.org/10.3390/cryst12101359\">10.3390/cryst12101359</a>}, journal={Crystals}, author={Padberg, Laura and Quiring, Viktor and Bocchini, Adriana and Santandrea, Matteo and Gerstmann, Uwe and Schmidt, Wolf Gero and Silberhorn, Christine and Eigner, Christof}, year={2022}, pages={1359} }","ama":"Padberg L, Quiring V, Bocchini A, et al. DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking. <i>Crystals</i>. 2022;12:1359. doi:<a href=\"https://doi.org/10.3390/cryst12101359\">10.3390/cryst12101359</a>"},"oa":"1"},{"volume":12,"user_id":"43720","publisher":"MDPI AG","_id":"41497","status":"public","quality_controlled":"1","citation":{"mla":"Pramanik, Sudipta, et al. “Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study.” <i>Crystals</i>, vol. 12, no. 9, 1217, MDPI AG, 2022, doi:<a href=\"https://doi.org/10.3390/cryst12091217\">10.3390/cryst12091217</a>.","ama":"Pramanik S, Milaege D, Hoyer K-P, Schaper M. Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study. <i>Crystals</i>. 2022;12(9). doi:<a href=\"https://doi.org/10.3390/cryst12091217\">10.3390/cryst12091217</a>","bibtex":"@article{Pramanik_Milaege_Hoyer_Schaper_2022, title={Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study}, volume={12}, DOI={<a href=\"https://doi.org/10.3390/cryst12091217\">10.3390/cryst12091217</a>}, number={91217}, journal={Crystals}, publisher={MDPI AG}, author={Pramanik, Sudipta and Milaege, Dennis and Hoyer, Kay-Peter and Schaper, Mirko}, year={2022} }","apa":"Pramanik, S., Milaege, D., Hoyer, K.-P., &#38; Schaper, M. (2022). Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study. <i>Crystals</i>, <i>12</i>(9), Article 1217. <a href=\"https://doi.org/10.3390/cryst12091217\">https://doi.org/10.3390/cryst12091217</a>","ieee":"S. Pramanik, D. Milaege, K.-P. Hoyer, and M. Schaper, “Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study,” <i>Crystals</i>, vol. 12, no. 9, Art. no. 1217, 2022, doi: <a href=\"https://doi.org/10.3390/cryst12091217\">10.3390/cryst12091217</a>.","chicago":"Pramanik, Sudipta, Dennis Milaege, Kay-Peter Hoyer, and Mirko Schaper. “Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study.” <i>Crystals</i> 12, no. 9 (2022). <a href=\"https://doi.org/10.3390/cryst12091217\">https://doi.org/10.3390/cryst12091217</a>.","short":"S. Pramanik, D. Milaege, K.-P. Hoyer, M. Schaper, Crystals 12 (2022)."},"doi":"10.3390/cryst12091217","language":[{"iso":"eng"}],"article_number":"1217","intvolume":"        12","publication_status":"published","date_updated":"2023-04-27T16:45:48Z","author":[{"full_name":"Pramanik, Sudipta","last_name":"Pramanik","first_name":"Sudipta"},{"first_name":"Dennis","last_name":"Milaege","full_name":"Milaege, Dennis"},{"full_name":"Hoyer, Kay-Peter","last_name":"Hoyer","first_name":"Kay-Peter","id":"48411"},{"full_name":"Schaper, Mirko","last_name":"Schaper","first_name":"Mirko","id":"43720"}],"publication_identifier":{"issn":["2073-4352"]},"title":"Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study","year":"2022","department":[{"_id":"9"},{"_id":"158"}],"type":"journal_article","keyword":["Inorganic Chemistry","Condensed Matter Physics","General Materials Science","General Chemical Engineering"],"date_created":"2023-02-02T14:27:40Z","abstract":[{"lang":"eng","text":"<jats:p>In this study, the design, additive manufacturing and experimental as well as simulation investigation of mechanical and thermal properties of cellular solids are addressed. For this, two cellular solids having nested and non-nested structures are designed and additively manufactured via laser powder bed fusion. The primary objective is to design cellular solids which absorb a significant amount of energy upon impact loading without transmitting a high amount of stress into the cellular solids. Therefore, compression testing of the two cellular solids is performed. The nested and non-nested cellular solids show similar energy absorption properties; however, the nested cellular solid transmits a lower amount of stress in the cellular structure compared to the non-nested cellular solid. The experimentally measured strain (by DIC) in the interior region of the nested cellular solid is lower despite a higher value of externally imposed compressive strain. The second objective of this study is to determine the thermal insulation properties of cellular solids. For measuring the thermal insulation properties, the samples are placed on a hot plate; and the surface temperature distribution is measured by an infrared camera. The thermal insulating performance of both cellular types is sufficient for temperatures exceeding 100 °C. However, the thermal insulating performance of a non-nested cellular solid is slightly better than that of the nested cellular solid. Additional thermal simulations predict a relatively higher temperature distribution on the cellular solid surfaces compared to experimental results. The simulated residual stress shows a similar distribution for both types, but the magnitude of residual stress is different for the cellular solids upon cooling from different temperatures of the hot plate.</jats:p>"}],"publication":"Crystals","issue":"9"},{"title":"Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study","year":"2022","author":[{"last_name":"Pramanik","first_name":"Sudipta","full_name":"Pramanik, Sudipta"},{"full_name":"Milaege, Dennis","first_name":"Dennis","last_name":"Milaege"},{"first_name":"Kay-Peter","last_name":"Hoyer","full_name":"Hoyer, Kay-Peter"},{"full_name":"Schaper, Mirko","first_name":"Mirko","last_name":"Schaper"}],"publication_identifier":{"issn":["2073-4352"]},"publication_status":"published","date_updated":"2023-04-27T16:48:04Z","intvolume":"        12","article_number":"1217","language":[{"iso":"eng"}],"doi":"10.3390/cryst12091217","publication":"Crystals","issue":"9","abstract":[{"lang":"eng","text":"<jats:p>In this study, the design, additive manufacturing and experimental as well as simulation investigation of mechanical and thermal properties of cellular solids are addressed. For this, two cellular solids having nested and non-nested structures are designed and additively manufactured via laser powder bed fusion. The primary objective is to design cellular solids which absorb a significant amount of energy upon impact loading without transmitting a high amount of stress into the cellular solids. Therefore, compression testing of the two cellular solids is performed. The nested and non-nested cellular solids show similar energy absorption properties; however, the nested cellular solid transmits a lower amount of stress in the cellular structure compared to the non-nested cellular solid. The experimentally measured strain (by DIC) in the interior region of the nested cellular solid is lower despite a higher value of externally imposed compressive strain. The second objective of this study is to determine the thermal insulation properties of cellular solids. For measuring the thermal insulation properties, the samples are placed on a hot plate; and the surface temperature distribution is measured by an infrared camera. The thermal insulating performance of both cellular types is sufficient for temperatures exceeding 100 °C. However, the thermal insulating performance of a non-nested cellular solid is slightly better than that of the nested cellular solid. Additional thermal simulations predict a relatively higher temperature distribution on the cellular solid surfaces compared to experimental results. The simulated residual stress shows a similar distribution for both types, but the magnitude of residual stress is different for the cellular solids upon cooling from different temperatures of the hot plate.</jats:p>"}],"date_created":"2023-02-02T14:22:59Z","keyword":["Inorganic Chemistry","Condensed Matter Physics","General Materials Science","General Chemical Engineering"],"type":"journal_article","department":[{"_id":"9"},{"_id":"158"}],"status":"public","publisher":"MDPI AG","_id":"41489","user_id":"48411","volume":12,"citation":{"short":"S. Pramanik, D. Milaege, K.-P. Hoyer, M. Schaper, Crystals 12 (2022).","chicago":"Pramanik, Sudipta, Dennis Milaege, Kay-Peter Hoyer, and Mirko Schaper. “Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study.” <i>Crystals</i> 12, no. 9 (2022). <a href=\"https://doi.org/10.3390/cryst12091217\">https://doi.org/10.3390/cryst12091217</a>.","apa":"Pramanik, S., Milaege, D., Hoyer, K.-P., &#38; Schaper, M. (2022). Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study. <i>Crystals</i>, <i>12</i>(9), Article 1217. <a href=\"https://doi.org/10.3390/cryst12091217\">https://doi.org/10.3390/cryst12091217</a>","ieee":"S. Pramanik, D. Milaege, K.-P. Hoyer, and M. Schaper, “Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study,” <i>Crystals</i>, vol. 12, no. 9, Art. no. 1217, 2022, doi: <a href=\"https://doi.org/10.3390/cryst12091217\">10.3390/cryst12091217</a>.","ama":"Pramanik S, Milaege D, Hoyer K-P, Schaper M. Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study. <i>Crystals</i>. 2022;12(9). doi:<a href=\"https://doi.org/10.3390/cryst12091217\">10.3390/cryst12091217</a>","bibtex":"@article{Pramanik_Milaege_Hoyer_Schaper_2022, title={Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study}, volume={12}, DOI={<a href=\"https://doi.org/10.3390/cryst12091217\">10.3390/cryst12091217</a>}, number={91217}, journal={Crystals}, publisher={MDPI AG}, author={Pramanik, Sudipta and Milaege, Dennis and Hoyer, Kay-Peter and Schaper, Mirko}, year={2022} }","mla":"Pramanik, Sudipta, et al. “Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study.” <i>Crystals</i>, vol. 12, no. 9, 1217, MDPI AG, 2022, doi:<a href=\"https://doi.org/10.3390/cryst12091217\">10.3390/cryst12091217</a>."}},{"publication":"Crystals","citation":{"ieee":"J. Brockmeier <i>et al.</i>, “Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging,” <i>Crystals</i>, Art. no. 1086, 2021, doi: <a href=\"https://doi.org/10.3390/cryst11091086\">10.3390/cryst11091086</a>.","apa":"Brockmeier, J., Mackwitz, P. W. M., Rüsing, M., Eigner, C., Padberg, L., Santandrea, M., Silberhorn, C., Zrenner, A., &#38; Berth, G. (2021). Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging. <i>Crystals</i>, Article 1086. <a href=\"https://doi.org/10.3390/cryst11091086\">https://doi.org/10.3390/cryst11091086</a>","short":"J. Brockmeier, P.W.M. Mackwitz, M. Rüsing, C. Eigner, L. Padberg, M. Santandrea, C. Silberhorn, A. Zrenner, G. Berth, Crystals (2021).","chicago":"Brockmeier, Julian, Peter Walter Martin Mackwitz, Michael Rüsing, Christof Eigner, Laura Padberg, Matteo Santandrea, Christine Silberhorn, Artur Zrenner, and Gerhard Berth. “Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging.” <i>Crystals</i>, 2021. <a href=\"https://doi.org/10.3390/cryst11091086\">https://doi.org/10.3390/cryst11091086</a>.","mla":"Brockmeier, Julian, et al. “Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging.” <i>Crystals</i>, 1086, 2021, doi:<a href=\"https://doi.org/10.3390/cryst11091086\">10.3390/cryst11091086</a>.","bibtex":"@article{Brockmeier_Mackwitz_Rüsing_Eigner_Padberg_Santandrea_Silberhorn_Zrenner_Berth_2021, title={Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging}, DOI={<a href=\"https://doi.org/10.3390/cryst11091086\">10.3390/cryst11091086</a>}, number={1086}, journal={Crystals}, author={Brockmeier, Julian and Mackwitz, Peter Walter Martin and Rüsing, Michael and Eigner, Christof and Padberg, Laura and Santandrea, Matteo and Silberhorn, Christine and Zrenner, Artur and Berth, Gerhard}, year={2021} }","ama":"Brockmeier J, Mackwitz PWM, Rüsing M, et al. Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging. <i>Crystals</i>. Published online 2021. doi:<a href=\"https://doi.org/10.3390/cryst11091086\">10.3390/cryst11091086</a>"},"abstract":[{"lang":"eng","text":"<jats:p>Potassium titanyl phosphate (KTP) is a nonlinear optical material with applications in high-power frequency conversion or quasi-phase matching in submicron period domain grids. A prerequisite for these applications is a precise control and understanding of the poling mechanisms to enable the fabrication of high-grade domain grids. In contrast to the widely used material lithium niobate, the domain growth in KTP is less studied, because many standard methods, such as selective etching or polarization microscopy, provides less insight or are not applicable on non-polar surfaces, respectively. In this work, we present results of confocal Raman-spectroscopy of the ferroelectric domain structure in KTP. This analytical method allows for the visualization of domain grids of the non-polar KTP y-face and therefore more insight into the domain-growth and -structure in KTP, which can be used for improved domain fabrication.</jats:p>"}],"date_created":"2021-09-07T08:09:36Z","type":"journal_article","department":[{"_id":"15"},{"_id":"288"}],"title":"Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging","status":"public","year":"2021","publication_identifier":{"issn":["2073-4352"]},"author":[{"full_name":"Brockmeier, Julian","last_name":"Brockmeier","first_name":"Julian","id":"44807"},{"full_name":"Mackwitz, Peter Walter Martin","first_name":"Peter Walter Martin","last_name":"Mackwitz"},{"full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","first_name":"Michael","last_name":"Rüsing","id":"22501"},{"last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","first_name":"Christof","full_name":"Eigner, Christof","id":"13244"},{"last_name":"Padberg","first_name":"Laura","full_name":"Padberg, Laura","id":"40300"},{"orcid":"0000-0001-5718-358X","last_name":"Santandrea","first_name":"Matteo","full_name":"Santandrea, Matteo","id":"55095"},{"last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263"},{"id":"606","last_name":"Zrenner","first_name":"Artur","orcid":"0000-0002-5190-0944","full_name":"Zrenner, Artur"},{"full_name":"Berth, Gerhard","last_name":"Berth","first_name":"Gerhard","id":"53"}],"date_updated":"2023-10-06T07:40:37Z","publication_status":"published","article_number":"1086","language":[{"iso":"eng"}],"_id":"23826","doi":"10.3390/cryst11091086","user_id":"13244"},{"volume":11,"user_id":"22501","_id":"47963","publisher":"MDPI AG","status":"public","quality_controlled":"1","citation":{"bibtex":"@article{Reitzig_Rüsing_Zhao_Kirbus_Mookherjea_Eng_2021, title={“Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films}, volume={11}, DOI={<a href=\"https://doi.org/10.3390/cryst11030288\">10.3390/cryst11030288</a>}, number={3288}, journal={Crystals}, publisher={MDPI AG}, author={Reitzig, Sven and Rüsing, Michael and Zhao, Jie and Kirbus, Benjamin and Mookherjea, Shayan and Eng, Lukas M.}, year={2021} }","ama":"Reitzig S, Rüsing M, Zhao J, Kirbus B, Mookherjea S, Eng LM. “Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films. <i>Crystals</i>. 2021;11(3). doi:<a href=\"https://doi.org/10.3390/cryst11030288\">10.3390/cryst11030288</a>","mla":"Reitzig, Sven, et al. “‘Seeing Is Believing’—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films.” <i>Crystals</i>, vol. 11, no. 3, 288, MDPI AG, 2021, doi:<a href=\"https://doi.org/10.3390/cryst11030288\">10.3390/cryst11030288</a>.","chicago":"Reitzig, Sven, Michael Rüsing, Jie Zhao, Benjamin Kirbus, Shayan Mookherjea, and Lukas M. Eng. “‘Seeing Is Believing’—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films.” <i>Crystals</i> 11, no. 3 (2021). <a href=\"https://doi.org/10.3390/cryst11030288\">https://doi.org/10.3390/cryst11030288</a>.","short":"S. Reitzig, M. Rüsing, J. Zhao, B. Kirbus, S. Mookherjea, L.M. Eng, Crystals 11 (2021).","ieee":"S. Reitzig, M. Rüsing, J. Zhao, B. Kirbus, S. Mookherjea, and L. M. Eng, “‘Seeing Is Believing’—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films,” <i>Crystals</i>, vol. 11, no. 3, Art. no. 288, 2021, doi: <a href=\"https://doi.org/10.3390/cryst11030288\">10.3390/cryst11030288</a>.","apa":"Reitzig, S., Rüsing, M., Zhao, J., Kirbus, B., Mookherjea, S., &#38; Eng, L. M. (2021). “Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films. <i>Crystals</i>, <i>11</i>(3), Article 288. <a href=\"https://doi.org/10.3390/cryst11030288\">https://doi.org/10.3390/cryst11030288</a>"},"doi":"10.3390/cryst11030288","language":[{"iso":"eng"}],"article_number":"288","article_type":"original","intvolume":"        11","publication_status":"published","date_updated":"2023-10-11T08:20:25Z","author":[{"last_name":"Reitzig","first_name":"Sven","full_name":"Reitzig, Sven"},{"id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","first_name":"Michael"},{"full_name":"Zhao, Jie","last_name":"Zhao","first_name":"Jie"},{"first_name":"Benjamin","last_name":"Kirbus","full_name":"Kirbus, Benjamin"},{"last_name":"Mookherjea","first_name":"Shayan","full_name":"Mookherjea, Shayan"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."}],"publication_identifier":{"issn":["2073-4352"]},"title":"“Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films","year":"2021","type":"journal_article","keyword":["Inorganic Chemistry","Condensed Matter Physics","General Materials Science","General Chemical Engineering"],"date_created":"2023-10-11T08:19:51Z","extern":"1","abstract":[{"text":"Nonlinear and quantum optical devices based on periodically-poled thin film lithium niobate (PP-TFLN) have gained considerable interest lately, due to their significantly improved performance as compared to their bulk counterparts. Nevertheless, performance parameters such as conversion efficiency, minimum pump power, and spectral bandwidth strongly depend on the quality of the domain structure in these PP-TFLN samples, e.g., their homogeneity and duty cycle, as well as on the overlap and penetration depth of domains with the waveguide mode. Hence, in order to propose improved fabrication protocols, a profound quality control of domain structures is needed that allows quantifying and thoroughly analyzing these parameters. In this paper, we propose to combine a set of nanometer-to-micrometer-scale imaging techniques, i.e., piezoresponse force microscopy (PFM), second-harmonic generation (SHG), and Raman spectroscopy (RS), to access the relevant and crucial sample properties through cross-correlating these methods. Based on our findings, we designate SHG to be the best-suited standard imaging technique for this purpose, in particular when investigating the domain poling process in x-cut TFLNs. While PFM is excellently recommended for near-surface high-resolution imaging, RS provides thorough insights into stress and/or defect distributions, as associated with these domain structures. In this context, our work here indicates unexpectedly large signs for internal fields occurring in x-cut PP-TFLNs that are substantially larger as compared to previous observations in bulk LN.","lang":"eng"}],"issue":"3","publication":"Crystals"},{"oa":"1","citation":{"bibtex":"@article{Beyreuther_Ratzenberger_Roeper_Kirbus_Rüsing_Ivleva_Eng_2021, title={Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals}, volume={11}, DOI={<a href=\"https://doi.org/10.3390/cryst11070780\">10.3390/cryst11070780</a>}, number={7780}, journal={Crystals}, publisher={MDPI AG}, author={Beyreuther, Elke and Ratzenberger, Julius and Roeper, Matthias and Kirbus, Benjamin and Rüsing, Michael and Ivleva, Liudmila I. and Eng, Lukas M.}, year={2021} }","ama":"Beyreuther E, Ratzenberger J, Roeper M, et al. Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals. <i>Crystals</i>. 2021;11(7). doi:<a href=\"https://doi.org/10.3390/cryst11070780\">10.3390/cryst11070780</a>","mla":"Beyreuther, Elke, et al. “Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals.” <i>Crystals</i>, vol. 11, no. 7, 780, MDPI AG, 2021, doi:<a href=\"https://doi.org/10.3390/cryst11070780\">10.3390/cryst11070780</a>.","chicago":"Beyreuther, Elke, Julius Ratzenberger, Matthias Roeper, Benjamin Kirbus, Michael Rüsing, Liudmila I. Ivleva, and Lukas M. Eng. “Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals.” <i>Crystals</i> 11, no. 7 (2021). <a href=\"https://doi.org/10.3390/cryst11070780\">https://doi.org/10.3390/cryst11070780</a>.","short":"E. Beyreuther, J. Ratzenberger, M. Roeper, B. Kirbus, M. Rüsing, L.I. Ivleva, L.M. Eng, Crystals 11 (2021).","ieee":"E. Beyreuther <i>et al.</i>, “Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals,” <i>Crystals</i>, vol. 11, no. 7, Art. no. 780, 2021, doi: <a href=\"https://doi.org/10.3390/cryst11070780\">10.3390/cryst11070780</a>.","apa":"Beyreuther, E., Ratzenberger, J., Roeper, M., Kirbus, B., Rüsing, M., Ivleva, L. I., &#38; Eng, L. M. (2021). Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals. <i>Crystals</i>, <i>11</i>(7), Article 780. <a href=\"https://doi.org/10.3390/cryst11070780\">https://doi.org/10.3390/cryst11070780</a>"},"quality_controlled":"1","funded_apc":"1","_id":"47964","publisher":"MDPI AG","volume":11,"user_id":"22501","status":"public","date_created":"2023-10-11T08:20:40Z","keyword":["Inorganic Chemistry","Condensed Matter Physics","General Materials Science","General Chemical Engineering"],"type":"journal_article","issue":"7","publication":"Crystals","abstract":[{"lang":"eng","text":"In the last two decades, variably doped strontium barium niobate (SBN) has attracted a lot of scientific interest mainly due to its specific non-linear optical response. Comparably, the parental compound, i.e., undoped SBN, appears to be less studied so far. Here, two different cuts of single-crystalline nominally pure strontium barium niobate in the composition Sr0.61Ba0.39Nb2O6 (SBN61) are comprehensively studied and analyzed with regard to their photoconductive responses. We present conductance measurements under systematically varied illumination conditions along either the polar z-axis or perpendicular to it (x-cut). Apart from a pronounced photoconductance (PC) already under daylight and a large effect upon super-bandgap illumination in general, we observe (i) distinct spectral features when sweeping the excitation wavelength over the sub-bandgap region as then discussed in the context of deep and shallow trap states, (ii) extremely slow long-term relaxation for both light-on and light-off transients in the range of hours and days, (iii) a critical dependence of the photoresponse on the pre-illumination history of the sample, and (iv) a current–voltage hysteresis depending on both the illumination and the electrical-measurement conditions in a complex manner."}],"extern":"1","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://doi.org/10.3390/cryst11070780","open_access":"1"}],"article_number":"780","doi":"10.3390/cryst11070780","author":[{"first_name":"Elke","last_name":"Beyreuther","full_name":"Beyreuther, Elke"},{"full_name":"Ratzenberger, Julius","first_name":"Julius","last_name":"Ratzenberger"},{"first_name":"Matthias","last_name":"Roeper","full_name":"Roeper, Matthias"},{"full_name":"Kirbus, Benjamin","last_name":"Kirbus","first_name":"Benjamin"},{"id":"22501","last_name":"Rüsing","first_name":"Michael","orcid":"0000-0003-4682-4577","full_name":"Rüsing, Michael"},{"full_name":"Ivleva, Liudmila I.","last_name":"Ivleva","first_name":"Liudmila I."},{"full_name":"Eng, Lukas M.","first_name":"Lukas M.","last_name":"Eng"}],"publication_identifier":{"issn":["2073-4352"]},"title":"Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals","year":"2021","intvolume":"        11","article_type":"original","date_updated":"2023-10-11T08:21:17Z","publication_status":"published"},{"citation":{"ama":"Suwannasopon S, Meyer F, Schlickriede C, et al. Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors. <i>Crystals</i>. 2019;9(10):515. doi:<a href=\"https://doi.org/10.3390/cryst9100515\">10.3390/cryst9100515</a>","bibtex":"@article{Suwannasopon_Meyer_Schlickriede_Chaisakul_T-Thienprasert_Limtrakul_Zentgraf_Chattham_2019, title={Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors}, volume={9}, DOI={<a href=\"https://doi.org/10.3390/cryst9100515\">10.3390/cryst9100515</a>}, number={10}, journal={Crystals}, author={Suwannasopon, Satayu and Meyer, Fabian and Schlickriede, Christian and Chaisakul, Papichaya and T-Thienprasert, Jiraroj and Limtrakul, Jumras and Zentgraf, Thomas and Chattham, Nattaporn}, year={2019}, pages={515} }","mla":"Suwannasopon, Satayu, et al. “Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors.” <i>Crystals</i>, vol. 9, no. 10, 2019, p. 515, doi:<a href=\"https://doi.org/10.3390/cryst9100515\">10.3390/cryst9100515</a>.","short":"S. Suwannasopon, F. Meyer, C. Schlickriede, P. Chaisakul, J. T-Thienprasert, J. Limtrakul, T. Zentgraf, N. Chattham, Crystals 9 (2019) 515.","chicago":"Suwannasopon, Satayu, Fabian Meyer, Christian Schlickriede, Papichaya Chaisakul, Jiraroj T-Thienprasert, Jumras Limtrakul, Thomas Zentgraf, and Nattaporn Chattham. “Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors.” <i>Crystals</i> 9, no. 10 (2019): 515. <a href=\"https://doi.org/10.3390/cryst9100515\">https://doi.org/10.3390/cryst9100515</a>.","apa":"Suwannasopon, S., Meyer, F., Schlickriede, C., Chaisakul, P., T-Thienprasert, J., Limtrakul, J., … Chattham, N. (2019). Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors. <i>Crystals</i>, <i>9</i>(10), 515. <a href=\"https://doi.org/10.3390/cryst9100515\">https://doi.org/10.3390/cryst9100515</a>","ieee":"S. Suwannasopon <i>et al.</i>, “Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors,” <i>Crystals</i>, vol. 9, no. 10, p. 515, 2019."},"_id":"13650","page":"515","volume":9,"user_id":"30525","status":"public","date_created":"2019-10-08T06:25:52Z","department":[{"_id":"15"},{"_id":"230"},{"_id":"289"}],"type":"journal_article","publication":"Crystals","issue":"10","abstract":[{"lang":"eng","text":"<jats:p>Surfaces covered with layers of ultrathin nanoantenna structures—so called metasurfaces have recently been proven capable of completely controlling phase of light. Metalenses have emerged from the advance in the development of metasurfaces providing a new basis for recasting traditional lenses into thin, planar optical components capable of focusing light. The lens made of arrays of plasmonic gold nanorods were fabricated on a glass substrate by using electron beam lithography. A 1064 nm laser was used to create a high intensity circularly polarized light focal spot through metalens of focal length 800 µm, N.A. = 0.6 fabricated based on Pancharatnam-Berry phase principle. We demonstrated that optical rotation of birefringent nematic liquid crystal droplets trapped in the laser beam was possible through this metalens. The rotation of birefringent droplets convinced that the optical trap possesses strong enough angular momentum of light from radiation of each nanostructure acting like a local half waveplate and introducing an orientation-dependent phase to light. Here, we show the success in creating a miniaturized and robust metalens based optical tweezers system capable of rotating liquid crystals droplets to imitate an optical motor for future lab-on-a-chip applications.</jats:p>"}],"language":[{"iso":"eng"}],"doi":"10.3390/cryst9100515","publication_identifier":{"issn":["2073-4352"]},"author":[{"full_name":"Suwannasopon, Satayu","last_name":"Suwannasopon","first_name":"Satayu"},{"full_name":"Meyer, Fabian","first_name":"Fabian","last_name":"Meyer"},{"full_name":"Schlickriede, Christian","first_name":"Christian","last_name":"Schlickriede","id":"59792"},{"full_name":"Chaisakul, Papichaya","last_name":"Chaisakul","first_name":"Papichaya"},{"last_name":"T-Thienprasert","first_name":"Jiraroj","full_name":"T-Thienprasert, Jiraroj"},{"full_name":"Limtrakul, Jumras","last_name":"Limtrakul","first_name":"Jumras"},{"full_name":"Zentgraf, Thomas","first_name":"Thomas","orcid":"0000-0002-8662-1101","last_name":"Zentgraf","id":"30525"},{"full_name":"Chattham, Nattaporn","last_name":"Chattham","first_name":"Nattaporn"}],"year":"2019","title":"Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors","intvolume":"         9","date_updated":"2022-01-06T06:51:41Z","publication_status":"published"}]