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Abstract
It is demonstrated that the concept of the elementary energy bands can be used to predict a structural change of a crystal's primitive cell during a phase transition without investigating this mechanism itself. Three examples of the phase transitions have been chosen: deformational phase transition occuring in GeTe (O5h), pressure induced phase transition in ZnTe (T2d) and induced by phonon-phonon interaction in SbSI (D162h). The discussed approach demands a knowledge about the space symmetry group of a crystal after phase transition.
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