Domain reversal and nonstoichiometry in lithium tantalate

被引:169
作者
Kim, S [1 ]
Gopalan, V
Kitamura, K
Furukawa, Y
机构
[1] Penn State Univ, Mat Res Lab, University Pk, PA 16802 USA
[2] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
[3] Natl Inst Mat Sci, Nanomat Lab, Tsukuba, Ibaraki 305, Japan
关键词
D O I
10.1063/1.1389525
中图分类号
O59 [应用物理学];
学科分类号
摘要
Recent studies have shown that lithium nonstoichiometry has a tremendous influence on domain reversal characteristics in ferroelectric lithium tantalate. This work presents a systematic study of the domain reversal characteristics such as threshold coercive fields for domain reversal, domain stabilization times, "backswitching" phenomena, domain switching and wall pinning times, and sideways wall mobility in near-stoichiometric LiTaO3 with Li/(Li+Ta)similar to0.498. These properties are contrasted with those of congruent LiTaO3 [Li/(Li+Ta)similar to0.485]. A qualitative model is proposed based on nonstoichiometric dipolar defects to explain the dependence of threshold coercive field on defect density, and on repeated field cycling, the origin of domain backswitching, and domain stabilization times. (C) 2001 American Institute of Physics.
引用
收藏
页码:2949 / 2963
页数:15
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