Giant piezoelectric response in piezoelectric/dielectric superlattices due to flexoelectric effect
Giant piezoelectric response in piezoelectric/dielectric superlattices due to flexoelectric effect
复制标题
由于挠曲电效应导致压电/介电超晶格中的巨压电响应
DOI：
10.1063/1.4967003
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发表时间：
2016-11
影响因子：
4
通讯作者：
Wang Jie
中科院分区：
文献类型：
--
作者：
Liu Chang;Wu Huaping;Wang Jie
挠曲电性描述了电极化对应变梯度的线性响应，可用于增强压电材料的压电效应或实现非压电材料的压电效应。在这里，我们从热力学理论证明了一个巨大的压电效应存在于压电/介电超晶格由于挠曲电效应。从压电/介电超晶格在正应力作用下极化分布的解析表达式的封闭形式计算了表观压电系数，其中考虑了挠曲电效应。结果表明，在压电/介电超晶格中，挠曲电效应和压电效应之间存在着强烈的非线性耦合，从而显著提高了表观压电系数.对于特定的压电层和介电层的厚度比，在超晶格中的增强的表观压电系数是其纯压电对应物的10倍。本文的工作为在压电/介电超晶格中利用挠曲电效应获得巨表观压电效应提供了一条有效途径。
Flexoelectricity describes the linear response of electrical polarization to a strain gradient, which can be used to enhance the piezoelectric effect of piezoelectric material or realize the piezoelectric effect in nonpiezoelectric materials. Here, we demonstrate from thermodynamics theory that a giant piezoelectric effect exists in piezoelectric/dielectric superlattices due to flexoelectric effect. The apparent piezoelectric coefficient is calculated from the closed-form of analytical expression of the polarization distribution in the piezoelectric/dielectric superlattice subjected to a normal stress, in which the flexoelectric effect is included. It is found that there exists a strong nonlinear coupling between the flexoelectric and piezoelectric effects, which significantly enhances the apparent piezoelectric coefficient in the piezoelectric/dielectric superlattice. For a specific thickness ratio of the piezoelectric and dielectric layers, the enhanced apparent piezoelectric coefficient in the superlattice is ten times larger than that of its pure piezoelectric counterpart. The present work suggests an effective way to obtain giant apparent piezoelectric effect in piezoelectric/dielectric superlattices through flexoelectric effect.
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