Simultaneously enhancing the <i>T</i> <sub>d</sub> and the thermal stability of the real‐time <i>d</i> <sub>33</sub> in BNT‐based piezoceramics
Jun Chen, Changrong Zhou, Kelin Chen, Qingning Li, Changlai Yuan, Jiwen Xu, Shuai Cheng, Jing‐Tai Zhao, Guanghui Rao
Abstract
Abstract One of the inherent disadvantages of Bi 0.5 Na 0.5 TiO 3 ‐based (BNT‐based) piezoceramics is that an increment of the depolarization temperature ( T d ) is generally accompanied by a deterioration of the temperature stability of the real‐time piezoelectric constant ( d 33 ), which severely restricts the practical applications of the materials. Herein, we propose a new strategy to mitigate the conflict between the elevation of T d and the temperature stability of the real‐time d 33 in BNT‐based ceramics via integrating the pressure‐assisted sintering and quenching process. By this strategy, we not only increased the T d from 109 to 166°C but also improved the temperature stability of the real‐time d 33 (the temperature coefficient T tc = ± 13 pC/N) in 0.94Bi 0.5 Na 0.5 TiO 3 –0.06BaTiO 3 ceramic. Both the built‐in field and the increment of the field‐induced R 3 c phase fraction play the significant role in enhancing the T d and the temperature stability of the real‐time d 33 . Thus, our work provides a simple and effective approach for designing piezoceramics with high T d and a superior temperature stability of the real‐time d 33 .