4.2 Article

(Bi1/2K1/2)TiO3 lead-free ferroelectric ceramics: processing, properties, and compositional modifications

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

  1. JSPS KAKENHI [25889049, 16K18241]
  2. Kumagai Foundation for Science and Technology
  3. Grants-in-Aid for Scientific Research [16K18241, 25889049] Funding Source: KAKEN

向作者/读者索取更多资源

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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