Physics of the Solid State
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Lattice dynamics and phase transitions in a crystal Ba2ZnTeO6
The lattice dynamics of Ba2ZnTeO6 double perovskite in three phases has been studied. Vibrational spectra and dynamic charges are calculated. In the rhomobohedral phase R3m, soft modes were found; after their condensation, the C2/m phase was obtained, which agrees with the experiment. An assessment was made of the dependence of the enthalpy of different phases on pressure; it showed that the monoclinic phase is more favorable at 0 pressure, but as the pressure increases to 2.9 GPa, the cubic phase Fm3m becomes advantageous. Keywords: Lattice dynamics, phase transitions, double perovskites.
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