[{"language":[{"iso":"eng"}],"extern":"1","keyword":["solid-state nmr","hard carbon","in-situ","SiCN","sodium ion batteries"],"user_id":"100715","_id":"63950","status":"public","abstract":[{"lang":"eng","text":"Sodium-ion batteries are at the forefront of new, sustainable energy systems required for the global energy transition. 23Na in situ solid-state nuclear magnetic resonance spectroscopy is capable of unraveling structures in working electrochemical cells during the charging and discharging processes. To evaluate its suitability for long-term studies, local sodium environments in sodium/sodium ion cells based on silicon carbonitride and hard carbon materials are tracked for up to 49 cycles (228.5?h). The formation of dendrites as well as the decay of a secondary metallic sodium species is observed, and local structures are analyzed up to the point of capacity degradation and cell failure. Initial points of cell breakdown are reflected in the NMR data by characteristic changes in signal intensities, whereas the degradation of the cells is reflected by a cease to periodic signal intensity fluctuations. Meanwhile, ex situ 23Na NMR spectra of the deactivated cells reveal a complex range of environments for sodium ions."}],"publication":"Batteries & Supercaps","type":"journal_article","doi":"10.1002/batt.202500516","title":"Long-Term Cycling Stability of Sodium/Sodium Ion Cells Probed by In Situ Solid-State NMR Spectroscopy","volume":"n/a","date_created":"2026-02-07T09:13:59Z","author":[{"first_name":"Sonja","full_name":"Egert, Sonja","last_name":"Egert"},{"first_name":"Renuka","last_name":"Remesh","full_name":"Remesh, Renuka"},{"full_name":"Jusdi, Agatha Clarissa","last_name":"Jusdi","first_name":"Agatha Clarissa"},{"last_name":"Sugawara","full_name":"Sugawara, Yushi","first_name":"Yushi"},{"full_name":"Schutjajew, Konstantin","last_name":"Schutjajew","first_name":"Konstantin"},{"first_name":"Martin","full_name":"Oschatz, Martin","last_name":"Oschatz"},{"full_name":"Buntkowsky, Gerd","last_name":"Buntkowsky","first_name":"Gerd"},{"last_name":"Gutmann","id":"118165","full_name":"Gutmann, Torsten","first_name":"Torsten"}],"publisher":"John Wiley & Sons, Ltd","date_updated":"2026-02-17T16:18:23Z","page":"e202500516","citation":{"chicago":"Egert, Sonja, Renuka Remesh, Agatha Clarissa Jusdi, Yushi Sugawara, Konstantin Schutjajew, Martin Oschatz, Gerd Buntkowsky, and Torsten Gutmann. “Long-Term Cycling Stability of Sodium/Sodium Ion Cells Probed by In Situ Solid-State NMR Spectroscopy.” <i>Batteries &#38; Supercaps</i> n/a, no. n/a (2025): e202500516. <a href=\"https://doi.org/10.1002/batt.202500516\">https://doi.org/10.1002/batt.202500516</a>.","ieee":"S. Egert <i>et al.</i>, “Long-Term Cycling Stability of Sodium/Sodium Ion Cells Probed by In Situ Solid-State NMR Spectroscopy,” <i>Batteries &#38; Supercaps</i>, vol. n/a, no. n/a, p. e202500516, 2025, doi: <a href=\"https://doi.org/10.1002/batt.202500516\">10.1002/batt.202500516</a>.","ama":"Egert S, Remesh R, Jusdi AC, et al. Long-Term Cycling Stability of Sodium/Sodium Ion Cells Probed by In Situ Solid-State NMR Spectroscopy. <i>Batteries &#38; Supercaps</i>. 2025;n/a(n/a):e202500516. doi:<a href=\"https://doi.org/10.1002/batt.202500516\">10.1002/batt.202500516</a>","short":"S. Egert, R. Remesh, A.C. Jusdi, Y. Sugawara, K. Schutjajew, M. Oschatz, G. Buntkowsky, T. Gutmann, Batteries &#38; Supercaps n/a (2025) e202500516.","mla":"Egert, Sonja, et al. “Long-Term Cycling Stability of Sodium/Sodium Ion Cells Probed by In Situ Solid-State NMR Spectroscopy.” <i>Batteries &#38; Supercaps</i>, vol. n/a, no. n/a, John Wiley &#38; Sons, Ltd, 2025, p. e202500516, doi:<a href=\"https://doi.org/10.1002/batt.202500516\">10.1002/batt.202500516</a>.","bibtex":"@article{Egert_Remesh_Jusdi_Sugawara_Schutjajew_Oschatz_Buntkowsky_Gutmann_2025, title={Long-Term Cycling Stability of Sodium/Sodium Ion Cells Probed by In Situ Solid-State NMR Spectroscopy}, volume={n/a}, DOI={<a href=\"https://doi.org/10.1002/batt.202500516\">10.1002/batt.202500516</a>}, number={n/a}, journal={Batteries &#38; Supercaps}, publisher={John Wiley &#38; Sons, Ltd}, author={Egert, Sonja and Remesh, Renuka and Jusdi, Agatha Clarissa and Sugawara, Yushi and Schutjajew, Konstantin and Oschatz, Martin and Buntkowsky, Gerd and Gutmann, Torsten}, year={2025}, pages={e202500516} }","apa":"Egert, S., Remesh, R., Jusdi, A. C., Sugawara, Y., Schutjajew, K., Oschatz, M., Buntkowsky, G., &#38; Gutmann, T. (2025). Long-Term Cycling Stability of Sodium/Sodium Ion Cells Probed by In Situ Solid-State NMR Spectroscopy. <i>Batteries &#38; Supercaps</i>, <i>n/a</i>(n/a), e202500516. <a href=\"https://doi.org/10.1002/batt.202500516\">https://doi.org/10.1002/batt.202500516</a>"},"year":"2025","issue":"n/a"},{"type":"journal_article","publication":"Chemsuschem","abstract":[{"lang":"eng","text":"Abstract In this work, we report on an improved cell assembly of cylindrical electrochemical cells for 23Na in-situ solid-state NMR (ssNMR) investigations. The cell set-up is suitable for using powder electrode materials. Reproducibility of our cell assembly is analyzed by preparing two cells containing hard carbon (HC) powder as working electrode and sodium metal as reference electrode. Electrochemical storage properties of HC powder electrode derived from carbonization of sustainable cellulose are studied by ssNMR. 23Na in-situ ssNMR monitors the sodiation/desodiation of a Na{\\textbar}NaPF6{\\textbar}HC cell (cell 1) over a period of 22?days, showing high cell stability. After the galvanostatic process, the HC powder material is investigated by high resolution 23Na ex-situ MAS NMR. The formation of ionic sodium species in different chemical environments is obtained. Subsequently, a second Na{\\textbar}NaPF6{\\textbar}HC cell (cell 2) is sodiated for 11?days achieving a capacity of 220?mAh/g. 23Na ex-situ MAS NMR measurements of the HC powder material extracted from this cell clearly indicate the presence of quasi-metallic sodium species next to ionic sodium species. This observation of quasi-metallic sodium species is discussed in terms of the achieved capacity of the cell as well as of side reactions of sodium in this electrode material."}],"status":"public","_id":"64045","user_id":"100715","keyword":["solid-state nmr","hard carbon","electrochemical cells","in-situ characterization","sodium"],"extern":"1","language":[{"iso":"eng"}],"publication_identifier":{"issn":["1864-5631"]},"year":"2023","citation":{"ama":"Šić E, Schutjajew K, Haagen U, et al. Electrochemical Sodium Storage in Hard Carbon Powder Electrodes Implemented in an Improved Cell Assembly: Insights from In-Situ and Ex-Situ Solid-State NMR. <i>Chemsuschem</i>. 2023;17:e202301300. doi:<a href=\"https://doi.org/10.1002/cssc.202301300\">10.1002/cssc.202301300</a>","chicago":"Šić, Edina, Konstantin Schutjajew, Ulrich Haagen, Hergen Breitzke, Martin Oschatz, Gerd Buntkowsky, and Torsten Gutmann. “Electrochemical Sodium Storage in Hard Carbon Powder Electrodes Implemented in an Improved Cell Assembly: Insights from In-Situ and Ex-Situ Solid-State NMR.” <i>Chemsuschem</i> 17 (2023): e202301300. <a href=\"https://doi.org/10.1002/cssc.202301300\">https://doi.org/10.1002/cssc.202301300</a>.","ieee":"E. Šić <i>et al.</i>, “Electrochemical Sodium Storage in Hard Carbon Powder Electrodes Implemented in an Improved Cell Assembly: Insights from In-Situ and Ex-Situ Solid-State NMR,” <i>Chemsuschem</i>, vol. 17, p. e202301300, 2023, doi: <a href=\"https://doi.org/10.1002/cssc.202301300\">10.1002/cssc.202301300</a>.","short":"E. Šić, K. Schutjajew, U. Haagen, H. Breitzke, M. Oschatz, G. Buntkowsky, T. Gutmann, Chemsuschem 17 (2023) e202301300.","mla":"Šić, Edina, et al. “Electrochemical Sodium Storage in Hard Carbon Powder Electrodes Implemented in an Improved Cell Assembly: Insights from In-Situ and Ex-Situ Solid-State NMR.” <i>Chemsuschem</i>, vol. 17, John Wiley &#38; Sons, Ltd, 2023, p. e202301300, doi:<a href=\"https://doi.org/10.1002/cssc.202301300\">10.1002/cssc.202301300</a>.","bibtex":"@article{Šić_Schutjajew_Haagen_Breitzke_Oschatz_Buntkowsky_Gutmann_2023, title={Electrochemical Sodium Storage in Hard Carbon Powder Electrodes Implemented in an Improved Cell Assembly: Insights from In-Situ and Ex-Situ Solid-State NMR}, volume={17}, DOI={<a href=\"https://doi.org/10.1002/cssc.202301300\">10.1002/cssc.202301300</a>}, journal={Chemsuschem}, publisher={John Wiley &#38; Sons, Ltd}, author={Šić, Edina and Schutjajew, Konstantin and Haagen, Ulrich and Breitzke, Hergen and Oschatz, Martin and Buntkowsky, Gerd and Gutmann, Torsten}, year={2023}, pages={e202301300} }","apa":"Šić, E., Schutjajew, K., Haagen, U., Breitzke, H., Oschatz, M., Buntkowsky, G., &#38; Gutmann, T. (2023). Electrochemical Sodium Storage in Hard Carbon Powder Electrodes Implemented in an Improved Cell Assembly: Insights from In-Situ and Ex-Situ Solid-State NMR. <i>Chemsuschem</i>, <i>17</i>, e202301300. <a href=\"https://doi.org/10.1002/cssc.202301300\">https://doi.org/10.1002/cssc.202301300</a>"},"intvolume":"        17","page":"e202301300","publisher":"John Wiley & Sons, Ltd","date_updated":"2026-02-17T16:13:10Z","date_created":"2026-02-07T16:12:13Z","author":[{"last_name":"Šić","full_name":"Šić, Edina","first_name":"Edina"},{"last_name":"Schutjajew","full_name":"Schutjajew, Konstantin","first_name":"Konstantin"},{"first_name":"Ulrich","full_name":"Haagen, Ulrich","last_name":"Haagen"},{"first_name":"Hergen","last_name":"Breitzke","full_name":"Breitzke, Hergen"},{"first_name":"Martin","last_name":"Oschatz","full_name":"Oschatz, Martin"},{"full_name":"Buntkowsky, Gerd","last_name":"Buntkowsky","first_name":"Gerd"},{"id":"118165","full_name":"Gutmann, Torsten","last_name":"Gutmann","first_name":"Torsten"}],"volume":17,"title":"Electrochemical Sodium Storage in Hard Carbon Powder Electrodes Implemented in an Improved Cell Assembly: Insights from In-Situ and Ex-Situ Solid-State NMR","doi":"10.1002/cssc.202301300"},{"type":"preprint","status":"public","abstract":[{"text":"Sodium-ion capacitors (SICs) have great potential in energy storage due to their low cost, the abundance of Na, and the potential to deliver high energy and power simultaneously. This paper demonstrates a template-assisted method to induce graphitic nanodomains and micro-mesopores into nitrogen-doped carbons. This study elucidates that these graphitic nanodomains are beneficial for Na+ storage. The obtained N-doped carbon (As8Mg) electrode achieved a reversible capacity of 254 mA h g−1 at 0.1 A g−1. Moreover, the As8Mg-based SIC device achieves high combinations of power/energy densities (52 W kg−1 at 204 Wh kg−1 and 10,456 W kg−1 at 51 Wh kg−1) with outstanding cycle stability (99.7% retention over 10000 cycles at 0.2 A g−1). Our findings provide insights into optimizing carbon’s microstructure to boost sodium storage in the pseudo-capacitive mode. ","lang":"eng"}],"user_id":"98120","_id":"47447","language":[{"iso":"eng"}],"keyword":["sodium ion capacitor","anode","template","N-doped carbons","graphitic nanodomains"],"citation":{"ieee":"N. Lopez Salas <i>et al.</i>, “Template-induced graphitic nanodomains in nitrogen-doped carbons enable high-performance sodium-ion capacitors - ACCEPTED MANUSCRIPT.” 2023.","chicago":"Lopez Salas, Nieves, Chun  Li, Zihan Song, Minliang Liu, Enrico Lepre, Markus Antonietti, Junwu Zhu, Jian Liu, and Yongsheng Fu. “Template-Induced Graphitic Nanodomains in Nitrogen-Doped Carbons Enable High-Performance Sodium-Ion Capacitors - ACCEPTED MANUSCRIPT,” 2023.","ama":"Lopez Salas N, Li C, Song Z, et al. Template-induced graphitic nanodomains in nitrogen-doped carbons enable high-performance sodium-ion capacitors - ACCEPTED MANUSCRIPT. Published online 2023.","bibtex":"@article{Lopez Salas_Li_Song_Liu_Lepre_Antonietti_Zhu_Liu_Fu_2023, title={Template-induced graphitic nanodomains in nitrogen-doped carbons enable high-performance sodium-ion capacitors - ACCEPTED MANUSCRIPT}, author={Lopez Salas, Nieves and Li, Chun  and Song, Zihan and Liu, Minliang and Lepre, Enrico and Antonietti, Markus and Zhu, Junwu and Liu, Jian and Fu, Yongsheng}, year={2023} }","short":"N. Lopez Salas, C. Li, Z. Song, M. Liu, E. Lepre, M. Antonietti, J. Zhu, J. Liu, Y. Fu, (2023).","mla":"Lopez Salas, Nieves, et al. <i>Template-Induced Graphitic Nanodomains in Nitrogen-Doped Carbons Enable High-Performance Sodium-Ion Capacitors - ACCEPTED MANUSCRIPT</i>. 2023.","apa":"Lopez Salas, N., Li, C., Song, Z., Liu, M., Lepre, E., Antonietti, M., Zhu, J., Liu, J., &#38; Fu, Y. (2023). <i>Template-induced graphitic nanodomains in nitrogen-doped carbons enable high-performance sodium-ion capacitors - ACCEPTED MANUSCRIPT</i>."},"year":"2023","author":[{"first_name":"Nieves","full_name":"Lopez Salas, Nieves","id":"98120","last_name":"Lopez Salas","orcid":"https://orcid.org/0000-0002-8438-9548"},{"first_name":"Chun ","full_name":"Li, Chun ","last_name":"Li"},{"full_name":"Song, Zihan","last_name":"Song","first_name":"Zihan"},{"last_name":"Liu","full_name":"Liu, Minliang","first_name":"Minliang"},{"full_name":"Lepre, Enrico","last_name":"Lepre","first_name":"Enrico"},{"first_name":"Markus","full_name":"Antonietti, Markus","last_name":"Antonietti"},{"last_name":"Zhu","full_name":"Zhu, Junwu","first_name":"Junwu"},{"first_name":"Jian","full_name":"Liu, Jian","last_name":"Liu"},{"first_name":"Yongsheng","full_name":"Fu, Yongsheng","last_name":"Fu"}],"date_created":"2023-09-26T10:11:50Z","date_updated":"2026-01-08T13:16:49Z","title":"Template-induced graphitic nanodomains in nitrogen-doped carbons enable high-performance sodium-ion capacitors - ACCEPTED MANUSCRIPT"},{"quality_controlled":"1","publication_identifier":{"issn":["0885-3010"]},"issue":"2","year":"2014","citation":{"bibtex":"@article{Isobe_Maeda_Bornmann_Hemsel_Morita_2014, title={Synthesis of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal method and properties of sintered (K0.48Na0.52)NBO3 ceramics}, volume={61}, DOI={<a href=\"https://doi.org/10.1109/TUFFC.2014.6722608\">10.1109/TUFFC.2014.6722608</a>}, number={2}, journal={Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on}, author={Isobe, G. and Maeda, Takafumi and Bornmann, Peter and Hemsel, Tobias and Morita, Takeshi}, year={2014}, pages={225–230} }","mla":"Isobe, G., et al. “Synthesis of Lead-Free Piezoelectric Powders by Ultrasonic-Assisted Hydrothermal Method and Properties of Sintered (K0.48Na0.52)NBO3 Ceramics.” <i>Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions On</i>, vol. 61, no. 2, 2014, pp. 225–30, doi:<a href=\"https://doi.org/10.1109/TUFFC.2014.6722608\">10.1109/TUFFC.2014.6722608</a>.","short":"G. Isobe, T. Maeda, P. Bornmann, T. Hemsel, T. Morita, Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions On 61 (2014) 225–230.","apa":"Isobe, G., Maeda, T., Bornmann, P., Hemsel, T., &#38; Morita, T. (2014). Synthesis of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal method and properties of sintered (K0.48Na0.52)NBO3 ceramics. <i>Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions On</i>, <i>61</i>(2), 225–230. <a href=\"https://doi.org/10.1109/TUFFC.2014.6722608\">https://doi.org/10.1109/TUFFC.2014.6722608</a>","ama":"Isobe G, Maeda T, Bornmann P, Hemsel T, Morita T. Synthesis of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal method and properties of sintered (K0.48Na0.52)NBO3 ceramics. <i>Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on</i>. 2014;61(2):225-230. doi:<a href=\"https://doi.org/10.1109/TUFFC.2014.6722608\">10.1109/TUFFC.2014.6722608</a>","chicago":"Isobe, G., Takafumi Maeda, Peter Bornmann, Tobias Hemsel, and Takeshi Morita. “Synthesis of Lead-Free Piezoelectric Powders by Ultrasonic-Assisted Hydrothermal Method and Properties of Sintered (K0.48Na0.52)NBO3 Ceramics.” <i>Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions On</i> 61, no. 2 (2014): 225–30. <a href=\"https://doi.org/10.1109/TUFFC.2014.6722608\">https://doi.org/10.1109/TUFFC.2014.6722608</a>.","ieee":"G. Isobe, T. Maeda, P. Bornmann, T. Hemsel, and T. Morita, “Synthesis of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal method and properties of sintered (K0.48Na0.52)NBO3 ceramics,” <i>Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on</i>, vol. 61, no. 2, pp. 225–230, 2014."},"page":"225-230","intvolume":"        61","date_updated":"2019-09-16T10:53:17Z","author":[{"first_name":"G.","last_name":"Isobe","full_name":"Isobe, G."},{"first_name":"Takafumi","last_name":"Maeda","full_name":"Maeda, Takafumi"},{"first_name":"Peter","full_name":"Bornmann, Peter","last_name":"Bornmann"},{"first_name":"Tobias","last_name":"Hemsel","full_name":"Hemsel, Tobias","id":"210"},{"last_name":"Morita","full_name":"Morita, Takeshi","first_name":"Takeshi"}],"date_created":"2019-05-20T13:10:14Z","volume":61,"title":"Synthesis of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal method and properties of sintered (K0.48Na0.52)NBO3 ceramics","doi":"10.1109/TUFFC.2014.6722608","type":"journal_article","publication":"Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on","abstract":[{"lang":"eng","text":"(K,Na)NbO3 ceramics have attracted much attention as lead-free piezoelectric materials with high piezoelectric properties. High-quality (K,Na)NbO3 ceramics can be sintered using KNbO3 and NaNbO3 powders synthesized by a hydrothermal method. In this study, to enhance the quality factor of the ceramics, high-power ultrasonic irradiation was employed during the hydrothermal method, which led to a reduction in the particle size of the resultant powders."}],"status":"public","_id":"9878","user_id":"55222","department":[{"_id":"151"}],"keyword":["Q-factor","ceramics","crystal growth from solution","particle size","piezoelectric materials","potassium compounds","powders","sintering","sodium compounds","ultrasonic effects","(K0.48Na0.52)NbO3","KNbO3 powders","NaNbO3 powders","high-power ultrasonic irradiation","lead-free piezoelectric materials","lead-free piezoelectric powders","particle size reduction","piezoelectric properties","quality factor","sintered (K0.48Na0.52)NbO3 ceramics","sintering","ultrasonic-assisted hydrothermal method","Acoustics","Ceramics","Lead","Piezoelectric materials","Powders","Radiation effects","Transducers"],"language":[{"iso":"eng"}]},{"doi":"10.1109/ULTSYM.2012.0048","title":"Piezoelectric applications of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics","author":[{"first_name":"Takafumi","last_name":"Maeda","full_name":"Maeda, Takafumi"},{"last_name":"Bornmann","full_name":"Bornmann, Peter","first_name":"Peter"},{"last_name":"Hemsel","full_name":"Hemsel, Tobias","id":"210","first_name":"Tobias"},{"first_name":"Takeshi","full_name":"Morita, Takeshi","last_name":"Morita"}],"date_created":"2019-05-13T13:28:05Z","date_updated":"2022-01-06T07:04:20Z","citation":{"ama":"Maeda T, Bornmann P, Hemsel T, Morita T. Piezoelectric applications of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics. In: <i>Ultrasonics Symposium (IUS), 2012 IEEE International</i>. ; 2012:194-195. doi:<a href=\"https://doi.org/10.1109/ULTSYM.2012.0048\">10.1109/ULTSYM.2012.0048</a>","ieee":"T. Maeda, P. Bornmann, T. Hemsel, and T. Morita, “Piezoelectric applications of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics,” in <i>Ultrasonics Symposium (IUS), 2012 IEEE International</i>, 2012, pp. 194–195.","chicago":"Maeda, Takafumi, Peter Bornmann, Tobias Hemsel, and Takeshi Morita. “Piezoelectric Applications of Hydrothermal Lead-Free (K0.48Na0.52)NbO3 Ceramics.” In <i>Ultrasonics Symposium (IUS), 2012 IEEE International</i>, 194–95, 2012. <a href=\"https://doi.org/10.1109/ULTSYM.2012.0048\">https://doi.org/10.1109/ULTSYM.2012.0048</a>.","apa":"Maeda, T., Bornmann, P., Hemsel, T., &#38; Morita, T. (2012). Piezoelectric applications of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics. In <i>Ultrasonics Symposium (IUS), 2012 IEEE International</i> (pp. 194–195). <a href=\"https://doi.org/10.1109/ULTSYM.2012.0048\">https://doi.org/10.1109/ULTSYM.2012.0048</a>","mla":"Maeda, Takafumi, et al. “Piezoelectric Applications of Hydrothermal Lead-Free (K0.48Na0.52)NbO3 Ceramics.” <i>Ultrasonics Symposium (IUS), 2012 IEEE International</i>, 2012, pp. 194–95, doi:<a href=\"https://doi.org/10.1109/ULTSYM.2012.0048\">10.1109/ULTSYM.2012.0048</a>.","bibtex":"@inproceedings{Maeda_Bornmann_Hemsel_Morita_2012, title={Piezoelectric applications of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics}, DOI={<a href=\"https://doi.org/10.1109/ULTSYM.2012.0048\">10.1109/ULTSYM.2012.0048</a>}, booktitle={Ultrasonics Symposium (IUS), 2012 IEEE International}, author={Maeda, Takafumi and Bornmann, Peter and Hemsel, Tobias and Morita, Takeshi}, year={2012}, pages={194–195} }","short":"T. Maeda, P. Bornmann, T. Hemsel, T. Morita, in: Ultrasonics Symposium (IUS), 2012 IEEE International, 2012, pp. 194–195."},"page":"194-195","year":"2012","quality_controlled":"1","publication_identifier":{"issn":["1948-5719"]},"language":[{"iso":"eng"}],"keyword":["crystallisation","hydrophones","piezoceramics","potassium compounds","powder technology","powders","sensors","sintering","sodium compounds","(K0.48Na0.52)NbO3","KNbO3 powder","NaNbO3 powder","crystallization","energy harvesting devices","g33 constant","hydrophone sensor","hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics","hydrothermal method","piezoelectric applications","sintering","Materials","Transducers"],"user_id":"55222","department":[{"_id":"151"}],"_id":"9788","status":"public","abstract":[{"lang":"eng","text":"A hydrothermal method utilizes a crystallization process in the solution so that the pure and high-quality powders can be realized. Sintering from the hydrothermal KNbO3 and NaNbO3 powders, a high-dense lead-free piezoelectric (K,Na)NbO3 ceramics could be obtained (density: 98.8\\%). Concerning about the g33 constant, high value as large as commercial PZT ceramics was measured. Therefore, the hydrothermal (K,Na)NbO3 ceramics is usable for the sensors and the energy harvesting devices. To demonstrate the (K,Na)NbO3 ceramics, a hydrophone sensor was fabricated and evaluated."}],"type":"conference","publication":"Ultrasonics Symposium (IUS), 2012 IEEE International"}]