Phase-field study of crystallographic texturing in piezoelectric polycrystals  

作　　者：Meixin Wang Tian Xia Liwei D.Geng 

机构地区：[1]Department of Materials Science and Engineering Sichuan University-Pittsburgh Institute,Sichuan University Chengdu,Sichuan 610065,P.R.China

出　　处：《Journal of Advanced Dielectrics》2022年第4期5-10,共6页先进电介质学报（英文）

摘　　要：Crystallographic texturing enables the design of piezoelectric polycrystals that outperform traditional random polycrystals by exhibiting outstanding piezoelectric properties.In this work,phase-field modeling and computer simulation were employed to study the effect of crystallographic texture on the piezoelectric properties of ferroelectric polycrystals at the domain level.Domain evolutions for single crystal,random polycrystal,and textured polycrystal are systematically simulated.The simulations reveal that the[001]-textured polycrystal can fully exploit the intrinsic anisotropic properties of piezoelectric materials by exhibiting a piezoelectric coefficient that is as large as that of single crystal while being much larger than that of random polycrystal.To better understand the mechanism of piezoelectricity enhancement by crystallographic texturing,a theoretical analysis based on Landau theory is provided.In comparison with random polycrystal,the textured polycrystal manifests a flatter energy landscape and thus possesses a higher piezoelectric coefficient.

关 键 词：Phase-field modeling piezoelectric polycrystal crystallographic texture textured polycrystal. 

分 类 号：O73[理学—晶体学]