1990 Volume 98 Issue 1140 Pages 846-849
The ferro-to-paraelectric phase transition was investigated with a special interest in the diffuse phase transition in BaTiO3-BaZrO3 solid solutions, which was characterized by the gradual change of the relative dielectric constant with temperature. In the diffuse phase transition, the change in the relative dielectric constant with temperature was not directly associated with the change in a crystal structure. The Curie temperature, at which the relative dielectric constant took a peak value, appeared in the solid solutions with cubic symmetry. The cubic-to-rhombohedral transition occured gradually at a temperature below the Curie temperature. The present experimental data could not satisfactorily be explained by the statistical compositional fluctuation model in solid solutions.