Polarization Freezing in Relaxor Ferroelectrics

被引：1

作者：

Pirc, R. ^{[1
]}

Blinc, R. ^{[1
]}

Bobnar, V. ^{[1
]}

机构：

[1] Jozef Stefan Inst, Ljubljana 1001, Slovenia

来源：

FERROELECTRICS | 2008年 / 370卷

关键词：

D O I：

10.1080/00150190802381670

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A simple mechanism for the freezing of polar nanoregions (PNRs) in relaxor ferroelectrics is presented. Using the local thermodynamic stability criterion for the polarizable medium in which the PNRs are embedded, the growth of the PNR correlation radius with decreasing temperature is derived. At the percolation threshold Tp an infinite cluster of PNRs is formed, and the relaxation time for its reorientation is shown to obey the Vogel-Fulcher (VF) relation, with Tp playing the role of the freezing or VF temperature. The effects of freezing on the dielectric permittivity are briefly discusssed.

引用

页码：203 / 206

页数：4

共 19 条

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