Abstract
We present a model of ferroelectrics which takes into account the softening of a transverse optical mode, the existence of dynamical spontaneous off-center displacements and their interaction with each other. In this paper we confine ourselves to temperatures above T c . The model is quantitatively compared with experimental results in two very different materials, PbTiO 3 and KNbO 3. The results show that the existence of off-center displacements and their interaction with the soft mode play a crucial role in explaining the properties of ferroelectric phase transitions in perovskite crystals and possibly other crystal families.
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