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所属单位：物理学院

发表刊物：The Journal of Physical Chemestry C

摘要：High-temperature piezoelectric ceramics with excellent piezoelectric properties and temperature stability are crucial for advancing high-temperature piezoelectric sensor applications. However, challenges such as relatively low piezoelectric responses and increased conductivity at elevated temperatures persist. In this study, we enhanced the piezoelectric and electrical properties of bismuth titanate-tantalate (Bi3TiTaO9) ceramics by introducing tungsten as a donor substitution. The Bi3Ti1–xWxTaO9 (abbreviated as BTT–100xW) ceramics were synthesized via a conventional solid-solution method. The substitution of tungsten induces tetragonal distortion and reduces the pinning effect on the domain wall, resulting in a significant enhancement of the piezoelectric performance. Specifically, BTT–3W exhibits a high piezoelectric constant (d33 = 15.3 pC/N) and an elevated Curie temperature (TC = 883 °C). Furthermore, BTT–3W demonstrates excellent thermal stability of its electromechanical coupling properties up to 650 °C. The dielectric and electrical properties of BTT–100xW ceramics were further investigated through frequency- and temperature-dependent dielectric/impedance spectroscopy. The reduced dielectric loss and changes in the conduction mechanisms suggest that a decrease in the concentration of oxygen vacancies is primarily responsible for the reduced conductivity at high temperatures. This study highlights the role of oxygen vacancy defects in tailoring the physical properties of BTT-based ceramics, making them promising candidates for high-temperature piezoelectric applications.

https://doi.org/10.1021/acs.jpcc.5c00697

全部作者：Qian Wang,Chen-Yang Liu,Yuan-Kai Yang,Le-Le Jia,Xian Zhao,Chun-Ming Wang

第一作者：Qian Wang

论文类型：期刊论文

通讯作者：Chun-Ming Wang

论文编号：1915344280630484994

学科门类：理学

一级学科：物理学

卷号：129

期号：15

页面范围：7196-7206

字数：5

是否译文：否

发表时间：2025-04-01

收录刊物：SCI