Activation energy for anion disordering in LnF3 (Ln = La, Ce, Pr) 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, UzbekistanKh. T. SharipovTashkent Institute of Chemical Technology, ul. Navoi 32, Tashkent, 100011, Uzbekistan
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Аннотация
The energetics of lattice disordering in crystals with the LaF3 structure has been studied by Raman spectroscopy. Analysis of the width of Raman lines indicates that, for T < T c (in the dielectric phase of LaF3), the activation energy for anion disordering is E d ≃ 0.20 eV. This value agrees well with the 0.22 eV obtained as the difference between the energies of a fluoride ion in lattice and interstitial sites in a finite crystalline LaF3 cluster.
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