GLASS-LIKE PHASE-TRANSITIONS AND DIELECTRIC NONLINEARITY IN LEAD MAGNESIUM NIOBATE CRYSTALS

被引：4

作者：

KRAINIK, NN

MARKOVA, LA

机构：

[1] A. F. loffe Physico-Technical Institute Acad. of Science, Polytechnicheskaya

来源：

FERROELECTRICS | 1992年 / 131卷 / 1-4期

关键词：

LEAD MAGNESIUM-NIOBATE; GLASS-LIKE STATE; DIFFUSED PHASE TRANSITIONS; DIFFERENTIAL DIELECTRIC NONLINEARITY;

D O I：

10.1080/00150199208223410

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Temperature dependence of differential dielectric nonlinearities beta = partial derivative2epsilon/partial derivative E2 of lead-magnesium-niobate crystals (PMN) has been studied using small-signal dielectric permittivity epsilon data when a bias electric field E= is applied to the crystal. The nonergodicity of PMN is observed at temperatures 150-300 K. As a bias electric field E= is decreased (50 less-than-or-equal-to E= < 500 V/cm), the value beta is increased. At fields 500 less-than-or-equal-to E= < 1,000 V/cm beta practically does not depend on E=. Two minima observed in temperature dependence beta correspond to phase transitions into glass-like state in PMN.

引用

页码：173 / 176

页数：4

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