Flexoelectricity in solids: Progress, challenges, and perspectives
Flexoelectricity in solids: Progress, challenges, and perspectives
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DOI：
10.1016/j.pmatsci.2019.05.003
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发表时间：
2019-12
影响因子：
37.4
通讯作者：
Bo Wang;Yijia Gu;Shujun Zhang;Long-qing Chen
中科院分区：
文献类型：
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作者：
Bo Wang;Yijia Gu;Shujun Zhang;Long-qing Chen
挠曲电性描述了电极化和应变梯度之间以及极化梯度和应变之间的线性耦合对固体热力学的贡献，并且表示由应变梯度引起的固体的极化变化量。虽然挠曲电效应的幅度通常很小，但其对固体的整体热力学的贡献在纳米尺度下可能变得显著或甚至占主导地位。最近的实验和计算的努力，导致我们的理解的挠曲电效应和其在设备，如传感器，执行器，能量采集器和纳米电子学的潜在应用的探索显着进步。本文综述了挠曲电的理论发展和实验进展，包括已探索的材料体系类型及其潜在的应用。我们讨论的挑战，在实验测量和密度泛函理论计算的挠曲电系数，包括了解现有的实验测量值和计算值之间的数量级差异。最后，我们提供了一个角度对未来的研究方向挠曲电。
The flexoelectricity describes the contribution of the linear couplings between the electric polarization and strain gradient and between polarization gradient and strain to the thermodynamics of a solid and represents the amount of polarization change of a solid arising from a strain gradient. Although the magnitude of the flexoelectric effect is generally small, its contribution to the overall thermodynamics of a solid may become significant or even dominant at the nanometer scale. Recent experimental and computational efforts have led to significant advances in our understanding of the flexoelectric effect and its exploration of potential applications in devices such as sensors, actuators, energy harvesters, and nanoelectronics. Here we review the theoretical development and experimental progress in flexoelectricity including the types of materials systems that have been explored and their potential applications. We discuss the challenges in the experimental measurements and density functional theory computations of the flexoelectric coefficients including understanding the order of magnitude discrepancies between existing experimentally measured and computed values. Finally, we offer a perspective on the future directions for research on flexoelectricity.