[{"user_id":"55222","volume":53,"page":"837 - 841","_id":"9866","status":"public","quality_controlled":"1","citation":{"ama":"Ohta K, Isobe G, Bornmann P, Hemsel T, Morita T. Study on optimizing ultrasonic irradiation period for thick polycrystalline PZT film by hydrothermal method. <i>Ultrasonics</i>. 2013;53(4):837-841. doi:<a href=\"https://doi.org/10.1016/j.ultras.2012.12.003\">10.1016/j.ultras.2012.12.003</a>","bibtex":"@article{Ohta_Isobe_Bornmann_Hemsel_Morita_2013, title={Study on optimizing ultrasonic irradiation period for thick polycrystalline PZT film by hydrothermal method}, volume={53}, DOI={<a href=\"https://doi.org/10.1016/j.ultras.2012.12.003\">10.1016/j.ultras.2012.12.003</a>}, number={4}, journal={Ultrasonics}, author={Ohta, Kanako and Isobe, Gaku and Bornmann, Peter and Hemsel, Tobias and Morita, Takeshi}, year={2013}, pages={837–841} }","mla":"Ohta, Kanako, et al. “Study on Optimizing Ultrasonic Irradiation Period for Thick Polycrystalline PZT Film by Hydrothermal Method.” <i>Ultrasonics</i>, vol. 53, no. 4, 2013, pp. 837–41, doi:<a href=\"https://doi.org/10.1016/j.ultras.2012.12.003\">10.1016/j.ultras.2012.12.003</a>.","short":"K. Ohta, G. Isobe, P. Bornmann, T. Hemsel, T. Morita, Ultrasonics 53 (2013) 837–841.","chicago":"Ohta, Kanako, Gaku Isobe, Peter Bornmann, Tobias Hemsel, and Takeshi Morita. “Study on Optimizing Ultrasonic Irradiation Period for Thick Polycrystalline PZT Film by Hydrothermal Method.” <i>Ultrasonics</i> 53, no. 4 (2013): 837–41. <a href=\"https://doi.org/10.1016/j.ultras.2012.12.003\">https://doi.org/10.1016/j.ultras.2012.12.003</a>.","apa":"Ohta, K., Isobe, G., Bornmann, P., Hemsel, T., &#38; Morita, T. (2013). Study on optimizing ultrasonic irradiation period for thick polycrystalline PZT film by hydrothermal method. <i>Ultrasonics</i>, <i>53</i>(4), 837–841. <a href=\"https://doi.org/10.1016/j.ultras.2012.12.003\">https://doi.org/10.1016/j.ultras.2012.12.003</a>","ieee":"K. Ohta, G. Isobe, P. Bornmann, T. Hemsel, and T. Morita, “Study on optimizing ultrasonic irradiation period for thick polycrystalline PZT film by hydrothermal method,” <i>Ultrasonics</i>, vol. 53, no. 4, pp. 837–841, 2013."},"doi":"10.1016/j.ultras.2012.12.003","language":[{"iso":"eng"}],"date_updated":"2019-09-16T10:54:27Z","intvolume":"        53","year":"2013","title":"Study on optimizing ultrasonic irradiation period for thick polycrystalline PZT film by hydrothermal method","publication_identifier":{"issn":["0041-624X"]},"author":[{"first_name":"Kanako","last_name":"Ohta","full_name":"Ohta, Kanako"},{"full_name":"Isobe, Gaku","first_name":"Gaku","last_name":"Isobe"},{"full_name":"Bornmann, Peter","first_name":"Peter","last_name":"Bornmann"},{"id":"210","full_name":"Hemsel, Tobias","last_name":"Hemsel","first_name":"Tobias"},{"last_name":"Morita","first_name":"Takeshi","full_name":"Morita, Takeshi"}],"type":"journal_article","keyword":["Piezoelectric material"],"department":[{"_id":"151"}],"date_created":"2019-05-20T12:03:07Z","abstract":[{"lang":"eng","text":"The hydrothermal method utilizes a solution-based chemical reaction to synthesize piezoelectric thin films and powders. This method has a number of advantages, such as low-temperature synthesis, and high purity and high quality of the product. In order to promote hydrothermal reactions, we developed an ultrasonic assisted hydrothermal method and confirmed that it produces dense and thick lead--zirconate--titanate (PZT) films. In the hydrothermal method, a crystal growth process follows the nucleation process. In this study, we verified that ultrasonic irradiation is effective for the nucleation process, and there is an optimum irradiation period to obtain thicker PZT films. With this optimization, a 9.2-$\\mu$ m-thick PZT polycrystalline film was obtained in a single deposition process. For this film, ultrasonic irradiation was carried out from the beginning of the reaction for 18 h, followed by a 6 h deposition without ultrasonic irradiation. These results indicate that the ultrasonic irradiation mainly promotes the nucleation process."}],"publication":"Ultrasonics","issue":"4"},{"quality_controlled":"1","citation":{"bibtex":"@article{Maeda_Takiguchi_Morita_Ishikawa_Hemsel_2010, title={Hydrothermal (K1-xNax)NbO3 Lead-free Piezoelectric Ceramics}, volume={57}, DOI={<a href=\"https://doi.org/10.3938/jkps.57.924\">10.3938/jkps.57.924</a>}, number={4}, journal={Journal of Korean Physical Society}, author={Maeda, Takafumi and Takiguchi, Norihito and Morita, Takeshi and Ishikawa, Mutsuo and Hemsel, Tobias}, year={2010}, pages={924–928} }","ama":"Maeda T, Takiguchi N, Morita T, Ishikawa M, Hemsel T. Hydrothermal (K1-xNax)NbO3 Lead-free Piezoelectric Ceramics. <i>Journal of Korean Physical Society</i>. 2010;57(4):924-928. doi:<a href=\"https://doi.org/10.3938/jkps.57.924\">10.3938/jkps.57.924</a>","mla":"Maeda, Takafumi, et al. “Hydrothermal (K1-XNax)NbO3 Lead-Free Piezoelectric Ceramics.” <i>Journal of Korean Physical Society</i>, vol. 57, no. 4, 2010, pp. 924–28, doi:<a href=\"https://doi.org/10.3938/jkps.57.924\">10.3938/jkps.57.924</a>.","short":"T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, T. Hemsel, Journal of Korean Physical Society 57 (2010) 924–928.","chicago":"Maeda, Takafumi, Norihito Takiguchi, Takeshi Morita, Mutsuo Ishikawa, and Tobias Hemsel. “Hydrothermal (K1-XNax)NbO3 Lead-Free Piezoelectric Ceramics.” <i>Journal of Korean Physical Society</i> 57, no. 4 (2010): 924–28. <a href=\"https://doi.org/10.3938/jkps.57.924\">https://doi.org/10.3938/jkps.57.924</a>.","ieee":"T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, and T. Hemsel, “Hydrothermal (K1-xNax)NbO3 Lead-free Piezoelectric Ceramics,” <i>Journal of Korean Physical Society</i>, vol. 57, no. 4, pp. 924–928, 2010.","apa":"Maeda, T., Takiguchi, N., Morita, T., Ishikawa, M., &#38; Hemsel, T. (2010). Hydrothermal (K1-xNax)NbO3 Lead-free Piezoelectric Ceramics. <i>Journal of Korean Physical Society</i>, <i>57</i>(4), 924–928. <a href=\"https://doi.org/10.3938/jkps.57.924\">https://doi.org/10.3938/jkps.57.924</a>"},"status":"public","volume":57,"user_id":"55222","_id":"9758","page":"924-928","abstract":[{"lang":"eng","text":"As a lead-free piezoelectric ceramics, (K,Na)NbO$_{3}$ is a promising material because of its good piezoelectric properties. In this study, (K$_{1-x}$Na$_{x}$)NbO$_{3}$ ceramics were synthesized from a KNbO$_{3}$ and NaNbO$_{3}$ mixture powder prepared by the hydrothermal reaction. The hydrothermal reaction enables the production of high quality powder for the ceramics fabrication process. To obtain (K$_{1-x}$Na$_{x}$)NbO$_{3}$ ceramics, these two powders KNbO$_{3}$ and NaNbO$_{3}$ were mixed and then sintered together. X-Ray diffraction analysis revealed that the solid solution ceramics (K$_{1-x}$Na$_{x}$)NbO$_{3}$ was produced by the sintering process. The K/Na ratio in (K$_{1-x}$Na$_{x}$)NbO$_{3}$ ceramics was optimized for the best piezoelectric properties. The optimized forms was (K$_{0.48}$Na$_{0.52}$)NbO$_{3}$, which showed the following piezoelectric properties; k$_{33}$=0.56, d$_{33}$=114pC/N. In addition, the ferroelectric properties, P$_{r}$=7.72mC/cm$^{2}$, E$_{c}$=857V/mm, and the Curie temperature T$_{c}$=420$_{o}$C were also measured."}],"publication":"Journal of Korean Physical Society","issue":"4","department":[{"_id":"151"}],"keyword":["Lead-free piezoelectric material","KNN","Hydrothermal method"],"type":"journal_article","date_created":"2019-05-13T10:19:43Z","intvolume":"        57","date_updated":"2022-01-06T07:04:19Z","author":[{"first_name":"Takafumi","last_name":"Maeda","full_name":"Maeda, Takafumi"},{"first_name":"Norihito","last_name":"Takiguchi","full_name":"Takiguchi, Norihito"},{"first_name":"Takeshi","last_name":"Morita","full_name":"Morita, Takeshi"},{"last_name":"Ishikawa","first_name":"Mutsuo","full_name":"Ishikawa, Mutsuo"},{"id":"210","full_name":"Hemsel, Tobias","first_name":"Tobias","last_name":"Hemsel"}],"publication_identifier":{"issn":["1948-5719"]},"title":"Hydrothermal (K1-xNax)NbO3 Lead-free Piezoelectric Ceramics","year":"2010","doi":"10.3938/jkps.57.924","language":[{"iso":"eng"}]},{"quality_controlled":"1","citation":{"mla":"Maeda, Takafumi, et al. “(K,Na)NbO3 Lead-Free Piezoelectric Ceramics Synthesized from Hydrothermal Powders.” <i>Materials Letters</i>, vol. 64, no. 2, 2010, pp. 125–28, doi:<a href=\"https://doi.org/10.1016/j.matlet.2009.10.012\">10.1016/j.matlet.2009.10.012</a>.","bibtex":"@article{Maeda_Takiguchi_Morita_Ishikawa_Hemsel_2010, title={(K,Na)NbO3 lead-free piezoelectric ceramics synthesized from hydrothermal powders}, volume={64}, DOI={<a href=\"https://doi.org/10.1016/j.matlet.2009.10.012\">10.1016/j.matlet.2009.10.012</a>}, number={2}, journal={Materials Letters}, author={Maeda, Takafumi and Takiguchi, Norihito and Morita, Takeshi and Ishikawa, Mutsuo and Hemsel, Tobias}, year={2010}, pages={125–128} }","ama":"Maeda T, Takiguchi N, Morita T, Ishikawa M, Hemsel T. (K,Na)NbO3 lead-free piezoelectric ceramics synthesized from hydrothermal powders. <i>Materials Letters</i>. 2010;64(2):125-128. doi:<a href=\"https://doi.org/10.1016/j.matlet.2009.10.012\">10.1016/j.matlet.2009.10.012</a>","ieee":"T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, and T. Hemsel, “(K,Na)NbO3 lead-free piezoelectric ceramics synthesized from hydrothermal powders,” <i>Materials Letters</i>, vol. 64, no. 2, pp. 125–128, 2010.","apa":"Maeda, T., Takiguchi, N., Morita, T., Ishikawa, M., &#38; Hemsel, T. (2010). (K,Na)NbO3 lead-free piezoelectric ceramics synthesized from hydrothermal powders. <i>Materials Letters</i>, <i>64</i>(2), 125–128. <a href=\"https://doi.org/10.1016/j.matlet.2009.10.012\">https://doi.org/10.1016/j.matlet.2009.10.012</a>","short":"T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, T. Hemsel, Materials Letters 64 (2010) 125–128.","chicago":"Maeda, Takafumi, Norihito Takiguchi, Takeshi Morita, Mutsuo Ishikawa, and Tobias Hemsel. “(K,Na)NbO3 Lead-Free Piezoelectric Ceramics Synthesized from Hydrothermal Powders.” <i>Materials Letters</i> 64, no. 2 (2010): 125–28. <a href=\"https://doi.org/10.1016/j.matlet.2009.10.012\">https://doi.org/10.1016/j.matlet.2009.10.012</a>."},"user_id":"55222","volume":64,"page":"125-128","_id":"9759","status":"public","type":"journal_article","keyword":["Lead-free piezoelectric material","(K","Na)NbO$_{3}$ ceramics","Sintering solid solution","Piezoelectric properties"],"department":[{"_id":"151"}],"date_created":"2019-05-13T10:21:17Z","abstract":[{"text":"Among various lead-free piezoelectric materials, (K,Na)NbO$_{3}$ is a very promising candidate. In this study, (K,Na)NbO$_{3}$ ceramics were sintered from mixed (K,Na)NbO$_{3}$ and NaNbO$_{3}$ powders prepared by hydrothermal reaction. These two powders were mixed with distilled water in a KNbO$_{3}$/NaNbO$_{3}$ molar ratio of 1. After sintering the mixed powder, the solid solution of (Na,K)NbO$_{3}$ ceramics was obtained. The electrical properties such as the electromechanical coupling factors k$_{p}$ and k$_{33}$, the mechanical quality factor, Q$_{m}$, and the piezoelectric constant d$_{33}$ of the sintered (K,Na)NbO$_{3}$ ceramics were 0.32, 0.48, 71 (radial mode), 118 ((33)mode), and 107 pC/N, respectively.","lang":"eng"}],"issue":"2","publication":"Materials Letters","doi":"10.1016/j.matlet.2009.10.012","language":[{"iso":"eng"}],"date_updated":"2022-01-06T07:04:19Z","intvolume":"        64","title":"(K,Na)NbO3 lead-free piezoelectric ceramics synthesized from hydrothermal powders","year":"2010","author":[{"full_name":"Maeda, Takafumi","last_name":"Maeda","first_name":"Takafumi"},{"full_name":"Takiguchi, Norihito","first_name":"Norihito","last_name":"Takiguchi"},{"full_name":"Morita, Takeshi","last_name":"Morita","first_name":"Takeshi"},{"full_name":"Ishikawa, Mutsuo","first_name":"Mutsuo","last_name":"Ishikawa"},{"full_name":"Hemsel, Tobias","last_name":"Hemsel","first_name":"Tobias","id":"210"}],"publication_identifier":{"issn":["1948-5719"]}}]