Large electrostrain with nearly-vanished hysteresis in eco-friendly perovskites by building coexistent glasses near quadruple point
Large electrostrain with nearly-vanished hysteresis in eco-friendly perovskites by building coexistent glasses near quadruple point
复制标题
通过在四极点附近构建共存玻璃，在环保钙钛矿中产生几乎消失滞后的大静电应变
DOI：
10.1016/j.nanoen.2021.106519
复制
发表时间：
2021-09-28
期刊：
影响因子：
17.6
通讯作者：
Ren, Xiaobing
中科院分区：
文献类型：
--
作者：
He, Liqiang;Wang, Dong;Ren, Xiaobing
发展环保型压电材料的关键问题之一是如何以简单有效的方式实现大的无压电效应的电应变响应，以满足高精度机电设备的要求。在这里，通过整合相场建模和实验方法，提出了一个非常有效的策略，大电应变输出与无铅钙钛矿氧化物铁电体的滞后可以忽略不计，通过构建共存的玻璃与不同的本地对称性附近的四重点呈现不同的极性状态之间的低能垒。相场模拟的指导下，一个上级的电应变- 0.21%与近零滞后获得在构造的玻璃区域附近的四极点的Bi掺杂的Ba（Zr0.2Ti0.8）O3-x（Ba0.7Ca0.3）TiO 3陶瓷，优于几乎最先进的无铅压电替代时，同时考虑电应变和滞后。在四极点附近构建共存玻璃的策略为高性能压电材料在高精度驱动器中的应用提供了一种新的设计范式。
One of the key questions in the development of eco-friendly piezoelectrics lies in how to achieve large hysteresisfree electrostrain responses in a facile and effective manner, to meet the requirements of high-precision electromechanical devices. Here, through integrating phase-field modeling and experimental approach, a highly effective strategy is proposed for large electrostrain outputs with negligible hysteresis in lead-free perovskite oxide ferroelectrics, by building coexistent glasses with diverse local symmetries near a quadruple point rendering low energy barriers between different polar states. Guided by phase-field simulations, a superior electrostrain of --- 0.21% with nearly-zero hysteresis is obtained at the constructed glasses region near the quadruple point of Bi-doped Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 ceramics, outperforming almost state-of-the-art lead-free piezoelectric substitutions when taking both electrostrain and hysteresis into account. The strategy of building coexistent glasses near the quadruple point provides a novel design paradigm for high-performance piezoelectric materials in the application of high-precision actuators.