Depolarization in a photosensitive relaxor ferroelectric

被引：3

作者：

Gladkii, V. V. ^{[1
]}

Ivanova, E. S. ^{[1
]}

Volk, T. R. ^{[1
]}

机构：

[1] Russian Acad Sci, AV Shubnikov Crystallog Inst, Moscow 119333, Russia

来源：

PHYSICS OF THE SOLID STATE | 2007年 / 49卷 / 11期

基金：

俄罗斯基础研究基金会;

关键词：

D O I：

10.1134/S1063783407110224

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

This paper reports a study of depolarization of a photosensitive relaxor ferroelectric Sr0.61Ba0.39Nb2O6 with 0.44 at. % La and 0.023 at. % Ce impurities at room temperature and under illumination of up to 0.22 mW/cm(2) stop in the absorption band of the crystal. The best fit to the experimental data was found with a function containing two time-dependent power-law terms. The approximation reflects two simultaneously operating polarization decay mechanisms, more specifically, polydomainization in the depolarizing field of a bounded crystal and screening of this field by photoinduced carriers. Exact double-humped distribution functions of nonexponential relaxation centers in the crystal have been derived from the relaxation times. Illumination shifts the distribution functions toward longer relaxation times.

引用

页码：2148 / 2153

页数：6

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