期刊
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
卷 129, 期 8, 页码 496-503出版社
CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI
DOI: 10.2109/jcersj2.21060
关键词
Ferroelectric ceramics; Pb-free material; Bismuth potassium titanate; Ceramic processing; Hydrothermal method; Phase transition
资金
- JSPS KAKENHI [25889049, 16K18241]
- Kumagai Foundation for Science and Technology
- Grants-in-Aid for Scientific Research [16K18241, 25889049] Funding Source: KAKEN
This paper reviews the fabrication process and fundamental properties of high-quality (Bi1/2K1/2)TiO3 ceramics, including crystal structure, physical/chemical stability, phase transition behavior, and compositional modifications for dielectric and piezoelectric materials. The hydrothermal synthesis method is utilized for the fabrication of (Bi1/2K1/2)TiO3 ceramics, and the electrical and electromechanical responses of the ceramic samples are discussed for potential applications in capacitors and actuators.
Bismuth potassium titanate (Bi1/2K1/2)TiO3 with an A-site complex perovskite structure is regarded as a promising lead-free ferroelectric/piezoelectric material. Studies on the fundamental properties of (Bi1/2K1/2)TiO3 have, however, been faced with difficulties in fabricating dense and phase-pure (i.e., high-quality) bulk ceramics caused by its low melting point and the volatility of Bi and K. This paper reviews our findings on the fabrication process and fundamental properties of such high-quality (Bi1/2K1/2)TiO3 ceramics. After a brief survey on the crystal structure and physical/chemical stability of (Bi1/2K1/2)TiO3 , our fabrication process of (Bi1/2K1/2)TiO3 ceramics utilizing the hydrothermal synthesis method is described. Then, the phase transition behavior of (Bi1/2K1/2)TiO3 is discussed based on the electrical and electromechanical responses of the high-quality ceramic samples. The last part of this paper presents two examples of compositional modifications of (Bi1/2K1/2)TiO3 ceramics aiming at developing dielectric and piezoelectric materials for use in capacitors and actuators. (C) 2021 The Ceramic Society of Japan. All rights reserved.
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