Large strain response based on relaxor-antiferroelectric coherence in Bi0.5Na0.5TiO3-SrTiO3-(K0.5Na0.5)NbO3 solid solutions
Large strain response based on relaxor-antiferroelectric coherence in Bi0.5Na0.5TiO3-SrTiO3-(K0.5Na0.5)NbO3 solid solutions
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DOI：
10.1063/1.4901549
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发表时间：
2014-11-14
影响因子：
3.2
通讯作者：
Chen, Jun
中科院分区：
文献类型：
--
作者：
Liu, Laijun;Shi, Danping;Chen, Jun
研究了（K0.5Na0.5）NbO 3（KNN）对90 Bi（0.5）Na（0.5）TiO（3）-10 SrTiO（3）（BNT-ST）无铅压电陶瓷铁电和介电性能的影响。极化曲线和应变电滞回线表明，当KNN取代ST达5%时，将产生弛豫-反铁电相干，并且随着温度的升高，双极应变增强，其类似于0.37%（对应于在90 ℃下类似于530 pm/V的大信号d（33）*），KNN内容。这种应变被分析为来自在较低的电场和场诱导的反铁电-铁电相变在较高的电场下的电致伸缩效应。大的极向应变响应对于环境友好的高温致动器将是极大的兴趣。(C)2014 AIP Publishing LLC.
The effect of (K0.5Na0.5)NbO3 (KNN) addition on the ferroelectric and dielectric behavior of 90Bi(0.5)Na(0.5)TiO(3)-10SrTiO(3) (BNT-ST) lead-free piezoceramics was investigated. Polarization and strain hysteresis loops indicate that a relaxor-antiferroelectric coherence will be produced with the addition of KNN as a replacement for ST up to 5% and the destabilization of the phase coherence is accompanied by an enhancement of the bipolar strain with the increase of temperature, which is similar to 0.37% (corresponding to a large signal d(33)* of similar to 530 pm/V at 90 degrees C) at 5mol.% KNN content. This strain was analyzed as derived from an electrostrictive effect at lower electric fields and a field-induced antiferroelectric-ferroelectric phase transition at higher electric fields. The large polar strain response would be of great interest for environmental friendly high-temperature actuators. (C) 2014 AIP Publishing LLC.