Title

Modeling the Dielectric Response and Relaxation Spectra of Relaxor Ferroelectrics

Abstract

A multi-Debye relaxation model that is based upon the Boltzmann superposition principle has been used to determine the frequency-dispersion behavior of Pb(Mg1/3-Nb2/3)O3 (PMN) and Pb0.88La0.08(Zr0.65Ti0.35)O3 (PLZT 8/65/35) relaxor ferroelectrics. For PMN, relaxation times on the order of seconds contribute to the dispersive character of the dielectric properties. A defect-relaxation mechanism that involves Mg cation hopping in a structure that is composed of interpenetrating 〈111〉 chains of ordered Pb(Mg1/2Nb1/2)O3 is proposed for PMN. Motion of the Mg cations results in destruction and reconstruction of these ordered chains, which contributes to the dispersive character of PMN.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Dielectric Relaxation; Lead Compounds; Magnesium; Mathematical Models

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1999 American Ceramic Society, All rights reserved.

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