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Ion transport in the anion-deficient nonstoichiometric phases La0.95(Ba1−x Srx)0.05F2.95 (0⩽x⩽1) (1998)

Sorokin, N. I. ; Fominykh, M. V. ; Krivandina, E. A. ; [et al.]

Springer

Physics of the solid state 40 (1998), S. 604-607

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ISSN: 1063-7834

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: 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.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1134/1.1130362

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