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Phenomenological model of dynamic nonlinear response of relaxor ferroelectrics

Phenomenological model of dynamic nonlinear response of relaxor ferroelectrics

Physical Review Letters 85(10): 2192-2195

A phenomenological model was proposed which describes frequency dispersion of nonlinear dielectric response of relaxor ferroelectrics (relaxors) as a result of dispersion of their linear dielectric permittivity. The model was applied to Pb(Mg(1/3)Nb(2/3))O3 (PMN) relaxor. It provided a good qualitative description of temperature and frequency dependence of the third harmonics of PMN. Analysis within the model yielded a frequency independent nonlinear coefficient corresponding to static nonlinear dielectric susceptibility. The model explained the recently reported for PMN data on the Vogel-Fulcher law for frequency dependence of the temperature at which the third harmonics passes a maximum.

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Accession: 046973425

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PMID: 10970495

DOI: 10.1103/physrevlett.85.2192

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