Dielectric study of KNbO3 ceramics over a large range of frequency (102 -109 hz) and temperature (300 -800 k)

被引：25

作者：

Dubernet, P ^{[1
]}

Ravez, J ^{[1
]}

机构：

[1] CNRS, ICMCB, F-33608 Pessac, France

来源：

FERROELECTRICS | 1998年 / 211卷 / 1-4期

关键词：

KNbO3; dielectric study; KTaO3;

D O I：

10.1080/00150199808232333

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

KNbO3 ceramics were sintered at 1263 K thanks to a LiF additive. The ferroelectric-paraelectric transition is of first order and occurs at T-c similar to 670 K. A dielectric study in a large frequency range (10(2) - 10(9) Hz) shows: a strong frequency dispersion of the permittivities at low frequency for T > 500 K which comes mainly from conductivity phenomena, a dispersion at high frequency in both ferroelectric and paraelectric regions which comes from a network relaxation of correlation chains of Nb5+ cations. The latter effect was revealed thanks to a new high frequency-high temperature device usable up to 10(9) Hz and 800 K simultaneously.

引用

页码：51 / 66

页数：16

共 23 条

[1] Dispersion and absorption in dielectrics I. Alternating current characteristics [J].