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Superionic conductivity of Sr0.68Pr0.32F2.32 (type CaF2) and Pr0.85Sr0.15F2.85 (type LaF3) crystals, as-grown and after high-temperature annealing

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Abstract

The influence of high-temperature annealing (900°C, 14 days) in a fluorinating atmosphere on the superionic conductivity σ of as-grown Sr0.68Pr0.32F2.32 single crystals with fluorite structure (CaF2) and Pr0.85Sr0.15F2.85 single crystals with tysonite structure (LaF3), obtained by the directional solidification of melts in the SrF2-PrF3 system using the Bridgman method, is studied. The annealing that brings the defect structure of crystals to equilibrium at 900°C (which is retained by quenching) does not affect σ values. At 500 K, σ is 4 × 10−4 and 2 × 10−2 S/cm for Sr0.68Pr0.32F2.32 and Pr0.85Sr0.15F2.85, respectively. As-grown superionic conductor single crystals, which are formed in some MF2-RF3 systems (M = Ca, Sr, Ba; R are rare earth elements), where the mutual solubility of components in nonstoichiometric phases depends weakly on temperature, can be used in solid-state electrochemical devices operating at high temperatures and under temperature cycling conditions without the deterioration of their electrical characteristics.

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia

    N. I. Sorokin, Z. I. Zhmurova, E. A. Krivandina & B. P. Sobolev

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  1. N. I. Sorokin
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  2. Z. I. Zhmurova
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  3. E. A. Krivandina
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  4. B. P. Sobolev
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Correspondence to N. I. Sorokin.

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Original Russian Text © N.I. Sorokin, Z.I. Zhmurova, E.A. Krivandina, B.P. Sobolev, 2014, published in Kristallografiya, 2014, Vol. 59, No. 1, pp. 98–102.

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Sorokin, N.I., Zhmurova, Z.I., Krivandina, E.A. et al. Superionic conductivity of Sr0.68Pr0.32F2.32 (type CaF2) and Pr0.85Sr0.15F2.85 (type LaF3) crystals, as-grown and after high-temperature annealing. Crystallogr. Rep. 59, 88–92 (2014). https://doi.org/10.1134/S1063774513050131

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  • DOI: https://doi.org/10.1134/S1063774513050131

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