The frequency-dependent polarization switching in nanograined BaTiO_(3) films under high-strength electric field  

作　　者：Ming-Ran Zhang Yu Su 

机构地区：[1]Department of Mechanics,School of Aerospace Engineering,Beijing Institute of Technology,Beijing,P.R.China [2]Department of Mechanical Engineering,Quzhou University,Quzhou,P.R.China

出　　处：《International Journal of Smart and Nano Materials》2023年第2期155-169,共15页国际智能和纳米材料杂志（英文）

基　　金：This work was supported by the National Natural Science Foundation of China under Grant No.12172046.

摘　　要：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 BaTiO_(3) 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.

关 键 词：FERROELECTRIC NANOGRAIN grain boundary phase field frequency dependence 

分 类 号：TB43[一般工业技术] TB383