高强度电场作用下纳米BaTiO3薄膜的频率相关极化开关

IF 4.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Smart and Nano Materials Pub Date : 2023-03-27 DOI:10.1080/19475411.2023.2195686

M. Zhang, Yu Su

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引用次数: 1

摘要

高强度交流电场作用下铁电纳米材料的极化重定向本质上是一个频率相关的过程。然而，相关的研究并不多见。本文报道了一种多晶BaTiO3纳米膜在0.1 ~ 80 kHz频率下的极化开关动力学和机电特性的相场研究。模型中考虑了晶界和平面应变。所得到的滞回和蝴蝶环随频率的变化呈现出显著的形状变化。通过基于域结构的分析，讨论了观测到的频率相关物理性质的潜在机制。此外，我们还考察了动力学系数对金兹堡-朗道方程的影响，以及电场振幅对频率依赖关系的影响。研究发现，较高的动力学系数或场幅值往往会增强极化开关的迁移率，并将高频特性转化为低频特性。图形抽象

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The frequency-dependent polarization switching in nanograined BaTiO3 films under high-strength electric field

ABSTRACT The polarization reorientation in ferroelectric nanomaterials under high-strength AC electric fields is intrinsically a frequency-dependent process. However, the related study is not widely seen. We report a phase-field investigation regarding the dynamics of polarization switching and the electromechanical characteristics of a polycrystalline BaTiO3 nanofilm under applied frequency from 0.1 to 80 kHz. The grain boundaries and the in-plane strains are considered in the model. The obtained hysteresis and butterfly loops exhibit a remarkable variety of shapes with the changing frequency. The underlying mechanism for the observed frequency-dependent physical properties was discussed via domain structure-based analysis. In addition, we examined the influence of the kinetic coefficient in the Ginzburg-Landau equation as well as the influence of the electric-field amplitude to the frequency dependency. It was found that a higher value of kinetic coefficient or field amplitude tends to enhance the mobility of polarization switching and to transform high-frequency characteristics to low-frequency ones. GRAPHICAL ABSTRACT

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来源期刊

International Journal of Smart and Nano Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.30

自引率

5.10%

发文量

审稿时长

11 weeks

期刊介绍： The central aim of International Journal of Smart and Nano Materials is to publish original results, critical reviews, technical discussion, and book reviews related to this compelling research field: smart and nano materials, and their applications. The papers published in this journal will provide cutting edge information and instructive research guidance, encouraging more scientists to make their contribution to this dynamic research field.