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Abstract
A unified theory of ferroelectric phase transitions is presented in the self-consistent phonon approximation using the analogy with the Moriya theory on itinerant electron ferromagnets. The “Rhodes-Wohlfarth ratios” are evaluated from available experimental data in ferroelectrics and the deviations of these ratios from unity in displacive type ferroelectrics are shown to be explained from this theory. The quantum effect on the dielectric susceptibility near T = 0 is studied as an application of the present theory.