PHASE FIELD SIMULATION OF DOMAIN SWITCHING IN FERROELECTRIC SINGLE CRYSTAL WITH ELECTRICALLY PERMEABLE AND IMPERMEABLE CRACKS  

作　　者：Hua qiao Jie Wang Weiqiu Chen 

机构地区：[1]Department of Engineering Mechanics,Zhejiang University,Yuquan Campus,Hangzhou 310027,China

出　　处：《Acta Mechanica Solida Sinica》2012年第1期1-8,共8页固体力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 10832009,11002123 and 11090333);the Zhejiang Provincial Natural Science Foundation under grant R6110115;the Chinese Universities Scientific Fund under grant 2009QNA4035;the program of Key Team of Technological Innovation of Zhejiang Province under grant2011R09025-07

摘　　要：Domain switching around electrically permeable and impermeable cracks in ferro-electric single crystals subjected to a mechanical load is investigated by using a phase field model.It is found that the electrical boundary conditions have little effect on the polarization distribution without any external load when the initial polarization is parallel to the crack,which is totally different from previous studies where the initial polarization is perpendicular to the crack.How-ever,the simulation results show that the electrical boundary conditions have great influence on the polarization distribution as well as the domain switching behavior when a mechanical load is applied.The critical mechanical load of domain switching with a permeable crack is much smaller than that in the case of an impermeable crack.Domain switching around electrically permeable and impermeable cracks in ferro-electric single crystals subjected to a mechanical load is investigated by using a phase field model.It is found that the electrical boundary conditions have little effect on the polarization distribution without any external load when the initial polarization is parallel to the crack,which is totally different from previous studies where the initial polarization is perpendicular to the crack.How-ever,the simulation results show that the electrical boundary conditions have great influence on the polarization distribution as well as the domain switching behavior when a mechanical load is applied.The critical mechanical load of domain switching with a permeable crack is much smaller than that in the case of an impermeable crack.

关 键 词：ferroelectric ceramics impermeable crack domain switching phase field model 

分 类 号：TM22[一般工业技术—材料科学与工程] TQ174.6[电气工程—电工理论与新技术]