Abstract
Temperature evolution of dielectric spectrum of (1-x)PbMg1/3Nb2/3O3–xPb(Zr0.53Ti0.47) O3 solid solutions has been studied in the frequency range 40 ÷ 106 Hz. Cole–Cole plots analysis of experimental data showed that the dielectric spectrum diffuseness degree α is high in a very wide temperature range in the case of relaxor compound but α is fast decreased below phase transition in the case of ferroelecrtic compound. The computer simulation of relaxor compound dielectric spectrum revealed that the average relaxation time to be almost temperature independent below some temperature. The temperatures of ϵ′ and ϵ″ maxima follow the Vogel–Fulcher equation but the distribution of relaxation times remains finite in the whole temperature range and the distribution function is very large, nearly uniform and temperature independent below the Vogel–Fulcher temperature in the case of relaxor compound.
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