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Ferroelectrics Letters Section Volume 40, 2013 - Issue 4-6
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Original Articles

Waterton-Mauro Description and Configurational Relaxativity of Relaxor Ferroelectrics

Wan Q. Cao Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Material, and School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
&
Shu J. Liu Key Laboratory of Processing and Testing Technology of Glass & Functional Ceramics of Shandong Province, Shandong Polytechnic University, Jinan, 250353, China
Pages 114-120 | Accepted 13 Jun 2013, Published online: 05 Nov 2013
 
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Abstract

Dielectric relaxation of relaxor ferroelectrics can be described by Vogel-Fulcher equation including a frozen temperature. For avoiding the problem, Waterton-Mauro equation is introduced to express the phenomenon based on the temperature dependent configurational entropy. Waterton-Mauro type relaxativity is derived to describe the degree of relaxation. By comparing the results of dielectric data of BaTiO3-SrZrO3(65/35), PMN-PT(90/10) and PMN-PT(100/0) ceramics a concept of “configuration relaxativity” is proposed to explain influence of change of configurations on relaxation, more exactly than the temperature interval between two dielectric peaks.

Acknowledgments

Communicated by Dr. Deborah J Taylor

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