Mechanical treatment of structural phase transitions and related phenomena in crystals: a lattice dynamical study of pressure-induced structural transformations in perovskite-like ReO3

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Abstract
The static interatomic forces that arise in a crystal owing to the change of external thermodynamic parameters are assumed to be responsible for lattice destabilization, and simple mechanical considerations that argue for this hypothesis are given. A model treatment of the simplest perovskite-like ReO3 is performed which provides the possibility to understand why this crystal loses its stability under hydrostatic compression, and becomes stable again when undergoing two successive structural phase transitions.