Abstract
A phenomenological theory of phase transitions in the solid solution of tetrafluorites KAlF4-RbAlF4 has been advanced. Causes have been established that give rise to a soft MX branch in the low-frequency phonon spectrum of KA1F4 and K1-xRbxAlF4 (x << 1). It has been shown that the observed specificities in the thermodynamic behaviour and the dynamic properties of these compounds can be accounted for by the presence of a relatively “free” subsystem of potassium cations.
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