Impedance spectroscopic studies of ferroelectric Pb2Sb3DyTi5O18 ceramic

被引：52

作者：

Suman, CK

Prasad, K ^{[1
]}

Choudhary, RNP

机构：

[1] TM Bhagalpur Univ, Dept Phys, Bhagalpur 812007, India

[2] Indian Inst Technol, Dept Phys & Meteorol, Kharagpur 721302, W Bengal, India

来源：

ADVANCES IN APPLIED CERAMICS | 2005年 / 104卷 / 06期

关键词：

activation energy; conductivity; dielectric relaxation; impedance spectroscopy; negative temperature coefficient of resistance;

D O I：

10.1179/174367605X62580

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：

The electrical properties of polycrystalline Pb2Sb3DyTi5O18 were investigated by complex impedance spectroscopy. The dielectric relaxation was found to be of polydispersive non-Debye type, and relaxation frequency shifts to higher frequencies with increasing temperature. Evidence of temperature dependent electrical relaxation phenomena as well as the negative temperature coefficient of resistance (NTCR) character of the sample have also been observed. The ac conductivity obeys the universal power law and dispersion in conductivity was observed in the lower frequency region. Also, the frequency dependent ac conductivity at different temperatures indicated that the conduction process is thermally activated. The activation energy was estimated to be 0.62 eV from the temperature variation of dc conductivity.

引用

页码：294 / 299

页数：6

共 14 条

[1]

Buchanan R. C, 1986, CERAMIC MAT ELECT

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