Ion transport in the anion-deficient nonstoichiometric phases La0.95(Ba1−x Srx)0.05F2.95 (0⩽x⩽1) |
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| Authors: | N. I. Sorokin M. V. Fominykh E. A. Krivandina Z. I. Zhmurova B. P. Sobolev O. I. Lyamina |
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| Affiliation: | (1) Institute of Crystallography, Russian Academy of Sciences, 117333 Moscow, Russia;(2) Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 101000 Moscow, Russia |
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| Abstract: | The fluoride-ion conductivity of the nonstoichiometric tysonite phases La0.95(Ba1−x Srx)0.05Fe2.95 (0⩽x⩽1) is investigated by impedance spectroscopy. Electrophysical measurements are performed in the frequency range 5–5×105 Hz and temperature range 300–700 K. A discontinuity is observed in the temperature dependence of the conductivity at T c=410–430 K. The behavior of the temperature dependence of the electrical conductivity is explained within a transport model taking into account the migration of fluoride ions between different inequivalent structural sites. The maximum value of the conductivity at room temperature (293 K) is 2×10−4 Ω−1 cm−1 for the solid solution La0.95Sr0.05F2.95. The fluorine-ion conductivity in La0.95(Ba1−x Srx)0.05F2.95 single crystals is almost an order of magnitude larger than the value for the commercial solid electrolyte La0.992Eu0.008F2.992 (a fluorine-selective membrane) having a tysonite structure. Fiz. Tverd. Tela (St. Petersburg) 40, 658–661 (April 1998) |
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