Ultra-slim pinched polarization-electric field hysteresis loops and thermally stable electrostrains in lead-free sodium bismuth titanate-based solid solutions
Ultra-slim pinched polarization-electric field hysteresis loops and thermally stable electrostrains in lead-free sodium bismuth titanate-based solid solutions
复制标题
无铅钛酸铋钠基固溶体中的超薄箍缩极化电场磁滞回线和热稳定电应变
DOI：
10.1016/j.jallcom.2019.02.329
复制
发表时间：
2019-06-05
影响因子：
6.2
通讯作者：
Liu, Gang
中科院分区：
文献类型：
--
作者：
Jin, Li;Pang, Jing;Liu, Gang
电致应变具有高振幅、高热稳定性和超低迟滞特性，在基础研究和高精度位移驱动器等工业应用中具有重要意义。在这项工作中，我们提出了一个战略，以满足这些要求，通过弛豫反铁电类材料，同时具有有趣的反铁电和弛豫特性。由于电场诱导的反铁电-铁电相变，其反铁电态将导致高的电应变，而弛豫态将提高电应变的温度稳定性和超薄电滞回线。根据这一策略，我们在无铅（Bi 0.5Na 0.5）TiO 3-x（Sr 0.7Bi 0.2）TiO 3（BNT-xSBT）固溶体中获得了高的电应变（在60 kV/cm下> 0.1%），同时具有良好的温度稳定性（从30 ℃到120 ℃应变变化< 20%）和超低滞后（< 7%）。电致应变的热稳定性与基于电致伸缩效应的极化的热稳定性直接相关。详细讨论了该系统的电致伸缩系数。这不仅证明了该策略的有效性，而且为在独特的BNT基固溶体中寻找具有良好热稳定性和超低滞后的高电致应变铺平了道路。(c)2019 Elsevier B. V.版权所有。
Electric field-induced strains (electrostrains) with high amplitude, high thermal stability and ultra-low hysteresis are of great interest both in fundamental researches and industrial applications, such as high-precision displacement actuators. In this work, we present a strategy to fulfil these requirements via a relaxor antiferroelectric-like material that possesses intriguing antiferroelectric and relaxor characteristics simultaneously. Its antiferroelectric state would result in high electrostrains because of the electric-field induced antiferroelectric-to-ferroelectric phase transition, while the relaxor state would boost the temperature stability and ultra-slim hysteresis of electrostrains. According to this strategy, we obtained high electrostrains (> 0.1% at 60 kV/cm) accompanying with good temperature stability (variation of strain < 20% from 30 degrees C to 120 degrees C) and ultra-low hysteresis (< 7%) in lead-free (Bi0.5Na0.5)TiO3-x(Sr0.7Bi0.2)TiO3 (BNT-xSBT) solid solutions. The thermal stability of the electrostrains is directly correlated to the thermal stability of polarization based on electrostrictive effect. The electrostrictive coefficient in this system is discussed in detail. This work not only proves the effectiveness of this strategy, but also paves a way to search high electrostrains with good thermal stability and ultra-low hysteresis in unique BNT-based solid solutions. (c) 2019 Elsevier B.V. All rights reserved.