Abstract
Adiabatic and differential scanning calorimetry data are presented on the heat capacity of inorganic compounds containing tetrahedral anions. The entropy and enthalpy of phase transitions in these compounds are evaluated, and the mechanisms of the transitions are discussed in terms of orientational disordering. The heat capacity data are used to estimate, by an additive scheme, the frequencies of lattice (translational and librational) vibrations. It is shown that the BH-4 anion experiences hindered rotation in lattice sites, while the anions in the other complex hydrides, perhalates, and fluoroborates undergo librational vibrations.
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