Ultrasonically-assisted Hydrothermal Method for Ferroelectric Material Synthesis Ageba, Ryo Kadota, Yoichi Maeda, Takafumi Takiguchi, Norihito Morita, Takeshi Ishikawa, Mutsuo Bornmann, Peter Hemsel, Tobias Hydrothermal method High-power ultrasonic PZT thin film Lead-free piezoelectric materials The hydrothermal method enables the production of high-quality piezoelectric materials. In this study, we propose to irradiate the reaction solutions with ultrasonic power during the hydrothermal method to obtain a shorter reaction time and a smooth film surface. A high-pressure reaction container for the ultrasonic transducer was newly developed, and the ultrasonically-assisted hydrothermal method was examined by using this container. The effect of ultrasonic assist on the synthesis of lead-zirconate-titanate (PZT) thin films and (K,Na)NbO$_{3}$ powders was verified. Thicker PZT film, thickness around 10 ${\mu}$m, could be obtained in one process, and (K,Na)NbO$_{3}$ powder was synthesized in half the previous reaction time. 2010 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_6501 https://ris.uni-paderborn.de/record/9743 Ageba R, Kadota Y, Maeda T, et al. Ultrasonically-assisted Hydrothermal Method for Ferroelectric Material Synthesis. <i>Journal of Korean Physical Society</i>. 2010;57(4):918-923. doi:<a href="https://doi.org/10.3938/jkps.57.918">10.3938/jkps.57.918</a> eng info:eu-repo/semantics/altIdentifier/doi/10.3938/jkps.57.918 info:eu-repo/semantics/altIdentifier/issn/1948-5719 info:eu-repo/semantics/closedAccess