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Non-Arrhenius behavior of the temperature dependence of superionic conductivity of a La0.95Sr0.05F2.95 single crystal
Russian version
Sorokin N. I. 1
1Shubnikov Institute of Crystallography of the Kurchatov Complex of Crystallography and Potonics of the National Research Centre "Kurchatov Institute", Russian Academy of Sciences, Moscow, Russia
Email: nsorokin1@yandex.ru
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The temperature dependence of the ionic electrical conductivity for a single crystal of the superionic conductor La0.95Sr0.05F2.95 with the tysonite-type structure (sp. gr. P3c1) was studied at 210-1073 K. It was found that, in the temperature range studied, ionic conductivity exhibits non-Arrhenius behavior and satisfies the Vogel-Tammann-Fulcher equation: σdcT1/2=σ0expl(-Δ HVTF/(T-T0)r) with parameters σ0=1.2· 102 SK1/2/cm, Δ HVTF=0.18 eV, and T0=85 K. This behavior of the σdc(T) dependence is apparently due to the energy distribution of ion carrier (fluorine vacancies) hops due to the structural microheterogeneity of the solid solution. The application of the Vogel-Tammann-Fulcher mathematical formalism is of undoubted interest for the study of superionic fluorine-conducting solid solutions. Keywords: ionic conductivity, superionic conductors, strontium and lanthanum fluorides, single crystals, tysonite structure, solid electrolytes.
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