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Modeling the Dielectric Response and Relaxation Spectra of Relaxor Ferroelectrics
Author(s) -
Lin HuhTswen,
Aken David C.,
Huebner Wayne
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02144.x
Subject(s) - relaxation (psychology) , dielectric , materials science , superposition principle , dispersion (optics) , condensed matter physics , debye , antiferroelectricity , spectral line , ferroelectricity , physics , optics , psychology , social psychology , optoelectronics , quantum mechanics , astronomy
A multi‐Debye relaxation model that is based upon the Boltzmann superposition principle has been used to determine the frequency‐dispersion behavior of Pb(Mg 1/3 ‐Nb 2/3 )O 3 (PMN) and Pb 0.88 La 0.08 (Zr 0.65 Ti 0.35 )O 3 (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(Mg 1/2 Nb 1/2 )O 3 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.