A phase-field model of relaxor ferroelectrics based on random field theory

被引：29
|
作者：
Wang, Shuai [1 ]
Yi, Min [1 ]
Xu, Bai-Xiang [1 ]
机构：
[1] Tech Univ Darmstadt, Inst Mat Sci, Mech Funct Mat Div, Jovanka Bontschits Str 2, D-64287 Darmstadt, Germany
来源：
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES | 2016年 / 83卷
关键词：
Phase-field modeling; Relaxor ferroelectrics; Random field theory; Finite element methods; FINITE-ELEMENT IMPLEMENTATION; DOMAIN EVOLUTION; THIN-FILMS; SIMULATIONS; CONTINUUM; HYSTERESIS; DEPENDENCE; CERAMICS; CRYSTALS; BEHAVIOR;
D O I：
10.1016/j.ijsolstr.2016.01.007
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
A mechanically coupled phase-field model is proposed for the first time to simulate the peculiar behavior of relaxor ferroelectrics. Based on the random field theory for relaxors, local random fields are introduced to characterize the effect of chemical disorder. This generic model is developed from a thermodynamic framework and the microforce theory and is implemented by a nonlinear finite element method. Simulation results show that the model can reproduce relaxor features, such as domain miniaturization, small remnant polarization and large piezoelectric response. In particular, the influence of random field strength on these features are revealed. Simulation results on domain structure and hysteresis behavior are discussed and compared with related experimental results. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：142 / 153
页数：12
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