THERMODYNAMIC PROPERTIES AND PHASE TRANSITIONS IN HALOGEN CRYSTALS WITH OCTAHEDRAL IONIC GROUPS IN A STRUCTURE

Halogen crystals with structures of perovskite, laminated perovskite, elpasolite and hexahydrates of hexaftorides have been investigated in the paper. The connection between connection stresses and crystal susceptibility to external actions has been established for the first time. The methodology for the determination of thermodynamic potential parameters on calorimetrical data has been developed for the first time. The identification reliability for a type of phase transitions on the entropy modification has been shown. The connection between the behaviour of thermodynamic properties and structure particular features of related perovskite-similar families of crystals has been established. The possibility of the construction of generalized phase diagrams of crystal families on the base of their thermodynamic parameters has been determined. The methodology for computer-aided measurements of heat capacity in the regime of continuous heating has been developedAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio