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Electrical and thermal conductivities of congruently melting single crystals of isovalent M 1 − x M′xF2 solid solutions (M, M′ = Ca, Sr, Cd, Pb) in relation to their defect fluorite structure

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Abstract

The electrical and thermal conductive properties of two-component single crystals of Pb0.67Cd0.33F2, Ca0.59Sr0.41F2, and Cd0.77Sr0.23F2 solid solutions with fluorite-type structure (CaF2), characterized by congruent melting (presence of minima in melting curves) and uniform distribution of components in the crystal bulk. Pb0.67Cd0.33F2 crystals, in contrast to isostructural Ca0.59Sr0.41F2 and Cd0.77Sr0.23F2 crystals, are characterized by high fluorine-ion electrical conductivity (σ = 0.02 S/m at 293 K); low ion-transport activation enthalpy (ΔH ≈ 0.4 eV); low thermal conductivity (k = 1.1 W/mK at 300 K); and glassy behavior of heat transfer, which is atypical for crystalline state. This anomalous behavior of the electrical and thermal conductivities of Pb0.67Cd0.33F2 crystals is due to the strong structural disordering of the anionic subsystem (which is retained at room temperature) as a result of isovalent replacements of Pb2+ cations with Cd2+ cations.

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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, D. N. Karimov, I. I. Buchinskaya & B. P. Sobolev

  2. Petrovsky Bryansk State University, Bryansk, 241036, Russia

    P. A. Popov

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  1. N. I. Sorokin
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  2. D. N. Karimov
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  3. I. I. Buchinskaya
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  4. P. A. Popov
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  5. B. P. Sobolev
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Correspondence to N. I. Sorokin.

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Original Russian Text © N.I. Sorokin, D.N. Karimov, I.I. Buchinskaya, P.A. Popov, B.P. Sobolev, 2015, published in Kristallografiya, 2015, Vol. 60, No. 4, pp. 586–590.

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Sorokin, N.I., Karimov, D.N., Buchinskaya, I.I. et al. Electrical and thermal conductivities of congruently melting single crystals of isovalent M 1 − x M′xF2 solid solutions (M, M′ = Ca, Sr, Cd, Pb) in relation to their defect fluorite structure. Crystallogr. Rep. 60, 532–536 (2015). https://doi.org/10.1134/S1063774515040215

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