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Abstract
A model for quantitative description of the relaxor ferroelectrics properties in the random field theory framework is proposed. An order parameter, phase transition temperature, critical concentration of random field sources were calculated with the help of the fields distribution function allowing for nonlinear and spatial correlation effects. Essential differencies were obtained in comparison with linear approach, namely the phase transition order change, appearance of maximum in transition temperature T, c concentrational dependence.
The comparison between calculated and experimental data has been made for the model ferroelectric relaxor PLZT x/65/35. Fairly good agreement between calculated and measured T c(x) and critical concentration of lanthanum have been obtained.