材料科学
居里温度
铁电性
压电
热稳定性
陶瓷
大气温度范围
铁电陶瓷
复合材料
铅(地质)
执行机构
电介质
凝聚态物理
光电子学
热力学
化学工程
铁磁性
电气工程
地貌学
物理
地质学
工程类
作者
Lei Wang,Ruihong Liang,Zhiyong Zhou,Xianlin Dong
摘要
BiFeO3-BaTiO3 ceramics possess both high electromechanical properties and a high Curie temperature, which are promising high temperature lead-free piezoactuator materials. However, the poor thermal stability of electrostrain limits their practical exploration. Here, we report a temperature stable electrostrain of 0.18% at 6 kV/mm, with a variation of 13% from 25 °C to 175 °C for (1-x)(0.67BiFeO3-0.33BaTiO3)-xSr0.8Bi0.1◻0.1TiO2.95 solid solutions with x = 0.04. The addition of a relaxor ferroelectric Sr0.8Bi0.1◻0.1TiO2.95 (SBT) breaks the long range ferroelectric order of BiFeO3-BaTiO3 (BFBT) ceramics. More importantly, the combined effect of the negative temperature dependent electrostrain for relaxors and the positive one for the parent BFBT contributes to the superior temperature stability of the electrostrain. This work provides an effective method for designing piezoelectric materials with an enhanced temperature stability for high temperature actuator applications.
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