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Origin of large electric-field-induced strain in pseudo-cubic BiFeO3-BaTiO3 ceramics
Acta Materialia ( IF 9.4 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.actamat.2020.07.032
Jianguo Chen , John E. Daniels , Jie Jian , Zhenxiang Cheng , Jinrong Cheng , Jianli Wang , Qinfen Gu , Shujun Zhang

Abstract High-performance lead-free piezoelectric materials are in great demand for actuator applications replacing the mainstay Pb(Zr, Ti)O3 materials. In this research, pseudo-cubic 0.64BiFeO3–0.36BaTiO3 (0.64BF–0.36BT) lead-free ceramics were studied, exhibiting high electric-field-induced strain of 0.38% (60 kV/cm) with large signal piezoelectric coefficient d33* of 720 pm/V (40 kV/cm) and low strain hysteresis of 8% at 150 °C. It is important that the strain (40 kV/cm) of prototypic co-fired multilayer actuator is found to increase from 0.22% to 0.3% at elevated temperature of 150 °C, accompanied by a significantly decreased strain hysteresis. The behind mechanism of the large unipolar strain was investigated by in-situ synchrotron powder X-ray diffraction under different electric fields, being analogous to (Bi, Na)TiO3-BaTiO3 based ceramics but different from Pb(Zr,Ti)O3 based counterparts. An evident transition from pseudo-cubic to rhombohedral phase was triggered above electric field of 10 kV/cm, where the lattice distortion, domain switching and phase transition synergistically contribute to the observed large macrostrain. These results demonstrate that the lead-free BiFeO3–BaTiO3 ferroelectric ceramics with pseudo-cubic phase have great potential for high temperature actuator applications.

中文翻译:

拟立方BiFeO3-BaTiO3陶瓷中大电场致应变的起源

摘要 高性能无铅压电材料在替代主要 Pb(Zr, Ti)O3 材料的执行器应用中需求量很大。在本研究中,研究了伪立方 0.64BiFeO3–0.36BaTiO3 (0.64BF–0.36BT) 无铅陶瓷,显示出 0.38% (60 kV/cm) 的高电场诱导应变和大信号压电系数 d33* 720 pm/V (40 kV/cm) 和 150 °C 下 8% 的低应变滞后。重要的是,原型共烧多层致动器的应变 (40 kV/cm) 在 150 °C 的高温下从 0.22% 增加到 0.3%,伴随着应变滞后的显着降低。通过原位同步加速器粉末X射线衍射在不同电场下研究了大单极应变的背后机制,类似于(Bi,Na)TiO3-BaTiO3 基陶瓷,但不同于 Pb(Zr,Ti)O3 基陶瓷。在 10 kV/cm 电场以上触发了从伪立方相到菱面体相的明显转变,其中晶格畸变、域切换和相变协同作用于观察到的大宏观应变。这些结果表明具有伪立方相的无铅 BiFeO3-BaTiO3 铁电陶瓷在高温致动器应用中具有巨大的潜力。
更新日期:2020-09-01
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