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We report measurements of the optic index of refraction as a function of temperature, n (T), in the crystalline ferroelectrics having the simple perovskite (ABO₃) structure. We show that these crystals possess a local, randomly oriented, nonreversible polarization below a temperature T₃ several hundred degrees above the ferroelectric phase-transition temperature T₂. Using a simple model, we account for this behavior and understand quantitatively the values of T₃. This model, we believe, contains the basic physical understanding of ferroelectrics with a diffuse phase transition.
Burns et al. (Thu,) studied this question.
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