Abstract
AbstractA generalization of the vibronic theory of ferroelectric phase transitions is made and the theory of antiferroelectric and structural modulated phase transitions, caused by the electron‐phonon interaction in dielectrics and semiconductors, is developed. The criteria for the occurrence of such transitions are obtained. The basic characteristics (spontaneous lattice distortion, dielectric susceptibility, frequencies of soft modes, etc.) are calculated. The dispersion of electronic states, corrections to the mean field approximation for the driving vibronic interaction, and phonon anharmonicity are taken into account. The relation between ferroelectric and antiferroelectric phase transitions is discussed.
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