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Abstract
It is shown that softening the acoustic mode, which brings about the occurrence of the proper ferroelastic phase transition in some crystals, is substantially due to the ``kinematic'' anharmonicity. The latter arises at the transition from the natural curvilinear coordinates of interatomic separation to the Cartesian atomic displacements. The equation for such crystals has been obtained, with whose help it appears possible to predict the pressure of the phase transtion to a triclinic phase if the initial elastic moduli are known.
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