Thermodynamic properties of LaF3 superionic crystals near their phase transition
V. F. KrivorotovDepartment of Thermophysics, Academy of Sciences of Uzbekistan, ul. Katartal 28, Tashkent, 100135, UzbekistanP. K. KhabibullaevDepartment of Thermophysics, Academy of Sciences of Uzbekistan, ul. Katartal 28, Tashkent, 100135, UzbekistanA. A. FridmanDepartment of Thermophysics, Academy of Sciences of Uzbekistan, ul. Katartal 28, Tashkent, 100135, UzbekistanKh. T. SharipovTashkent Institute of Chemical Technology, ul. Navoi 32, Tashkent, 100011, Uzbekistan
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Abstract
We examine the behavior of the entropy (S d), enthalpy (H), and concentration of disordered fluoride ions (n) in LaF3 in a broad temperature range around its critical temperature using a model for structural lattice disordering. We analyze the relationship between the free energy of a crystal and LaF3 lattice disordering parameters: entropy, S d; anion sublattice disordering energy, E a; and the concentration of vacancy-interstitial defect complexes, n. H(T), n(T), and S d(T) data are obtained for the phase transition region.
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