Domain switching in polycrystalline ferroelectric ceramics

被引:387
作者
Li, JY
Rogan, RC
Üstündag, E
Bhattacharya, K [1 ]
机构
[1] CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA
[2] Univ Nebraska, Dept Engn Mech, Lincoln, NE 68588 USA
[3] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA
关键词
D O I
10.1038/nmat1485
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ferroelectric ceramics are widely used as sensors and actuators for their electro- mechanical properties, and in electronic applications for their dielectric properties. Domain switching - the phenomenon wherein the ferroelectric material changes from one spontaneously polarized state to another under electrical or mechanical loads - is an important attribute of these materials. However, this is a complex collective process in commercially used polycrystalline ceramics that are agglomerations of a very large number of variously oriented grains. As the domains in one grain attempt to switch, they are constrained by the differently oriented neighbouring grains. Here we use a combined theoretical and experimental approach to establish a relation between crystallographic symmetry and the ability of a ferroelectric polycrystalline ceramic to switch. In particular, we show that equiaxed polycrystals of materials that are either tetragonal or rhombohedral cannot switch; yet polycrystals of materials where these two symmetries co- exist can in fact switch.
引用
收藏
页码:776 / 781
页数:6
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