Abstract
Electromechanical interactions in the phase transformation of crystals are discussed from the macroscopic and crystallographic points of view. The depolarizing-field effects are described in connection with the electromechanical couplings in piezoelectric media. The electrical conditions determining effective elastic constants of the sounds are elucidated. Morphic effects in the phase transition are argued from the two aspects of "induced effect" and "symmetry superposition". The similar argument is also applied to the case of ferromagnetic materials, and the macroscopic description is given of the magnetomechanical interactions.
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