Abstract
Some new possibilities of determining the gaussian distribution of CurieWeiss temperatures and relaxation times in relaxors and in ferroelectrics with a diffused phase transition are presented in this paper. The method of determining the width of gaussian distribution of Curie-Weiss temperatures with the use of the reciprocal of dielectric permittivity on normalized plots is applied to solid solution Ba(Ti1 xSnx)O3. The method of estimating the gauss-logarithmic distribution of relaxation times based on normalized plots is proposed for relaxors. It is shown that the Vogel-Fulcher behaviour of real and imaginary parts of the dielectric permittivity in PMN is caused by gauss-logarithmic distribution of relaxation times and by its temperature dependence.
Highlights
Ferroelectrics with a diffused phase transition (DPT) were discovered in nineteen fifties [1,2,3]
The main aim of this paper is to present some new possibilities and the results of determining the width of gaussian distribution of Curie-Weiss temperatures and relaxation times in relaxors and in ferroelectrics with a diffused phase transition
Some new possibilities of determining the gaussian distribution of Curie-Weiss temperatures and relaxation times are presented for relaxors and ferroelectrics with a diffused phase transition:
Summary
Ferroelectrics with a diffused phase transition (DPT) were discovered in nineteen fifties [1,2,3]. The main properties of relaxor ferroelectrics are as follows:. Temperatures of transition estimated by various methods are different. Diffused phase transitions are observed, for example, in the fine grained ceramics (even if a sharp phase transition is always observed in single crystals). Moreira and Lobo [4] investigated diffused phase transitions in the fine grained BaTiO3 ceramics obtained by sol-gel method and estimated the width of gaussian distribution of local Curie temperatures using the normalized plots. The main aim of this paper is to present some new possibilities and the results of determining the width of gaussian distribution of Curie-Weiss temperatures and relaxation times in relaxors and in ferroelectrics with a diffused phase transition
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