TEMPERATURE-DEPENDENCE OF ULTRA-LOW-FREQUENCY DIELECTRIC-RELAXATION OF BARIUM-TITANATE CERAMIC

被引：14

作者：

CHU, F

SUN, HT

ZHANG, LY

YAO, X

机构：

[1] Electronic Materials Research Laboratory EMRL, Xi'an Jiaotong University, Xi'An

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1992年 / 75卷 / 11期

关键词：

D O I：

10.1111/j.1151-2916.1992.tb04368.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Based on a linear voltage ramp method, ultraslow dielectric relaxation of undoped BaTiO3 ceramic has been carefully measured over the temperature range between -180-degrees and +120-degrees-C. Temperature dependence of the dielectric constant in the frequency range from 10(-5) to 10(-1) Hz can be obtained using Kramers-Kronig equations. Close to the Curie temperature, the dielectric constant increases so rapidly that the Curie peak is overwhelmed. Two kinds of relaxation processes were observed in this experiment. Ferroelectric domain and mobile charge are proposed to be responsible for the relaxation over the temperature range. With temperature increasing, Maxwell-Wagner relaxation associated with mobile charge gradually dominates. From relaxation time constants at various temperatures, relaxation activation energies about 0.06 and 0.09 eV are identified.

引用

页码：2939 / 2944

页数：6