Abstract
We report measurements of the optic index of reflection as a function of temperature, n( T), for several highly disordered ferroelectrics: PLZT ceramic [Pb 1− x La x (Zr 0.65Ti 0.35) 1− x/4 O 3 where x = 0.08] and single crystals of Pb 3(MNb 2)O 9 where M = Zn and Mg. The results are qualitatively different from the unusual displacive ferroelectric behavior and the difference is clearly due to local disorder.
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