Specific heat and enthalpy of lattice disordering of LaF3 superionic crystals
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, UzbekistanE. V. CharnayaFock Institute of Physics, St. Petersburg State University, Ul’yanovskaya ul. 1, Petrodvorets, 198504, RussiaKh. T. SharipovTashkent Institute of Chemical Technology, ul. Navoi 32, Tashkent, 100011, Uzbekistan
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Annotatsiya
Specific heat (C p ) data obtained near the phase transition of LaF3 are used to estimate the activation enthalpy for anion disordering, H d. At the critical point T c = 263 K, the concentration of disordered fluoride ions is n c = 2.86 × 1020 g−1. In the dielectric phase of LaF3 (T < T c), H d is 0.24–0.26 eV. In the superionic phase (T ≥ T c), where the concentration of disordered fluoride ions exceeds n c, the enthalpy of disordering drops to H d ≃ 0.04 eV.
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