Table of Contents
Journal of Ceramics
Volume 2013 (2013), Article ID 795827, 7 pages
http://dx.doi.org/10.1155/2013/795827
Research Article

Mean-Field Approach to Dielectric Relaxation in Giant Dielectric Constant Perovskite Ceramics

1College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
2Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, China
3Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Hong Kong
4School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China

Received 25 June 2013; Accepted 25 August 2013

Academic Editor: Matjaz Valant

Copyright © 2013 Shanming Ke et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The dielectric properties of CaCu3Ti4O3 (CCTO) and A2FeNbO6 (AFN, A = Ba, Sr, and Ca) giant dielectric constant ceramics were investigated in the frequency range from 1 Hz to 10 MHz. The relaxation properties can be perfectly described by a polaron model, indicating that the dielectric relaxation is intimately related to the hopping motion caused by localized charge carriers.