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A Crystal-Physical Model of Electrotransfer in the Superionic Conductor Pb1 – xSc x F2 + x (x = 0.1)

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Abstract

The frequency (ν = 10–1–107 Hz) dependences of electrical conductivity σ(ν) of single crystals of superionic conductor Pb0.9Sc0.1F2.1 (10 mol % ScF3) with fluorite type structure (CaF2) in the temperature range 153–410 K have been investigated. The static bulk conductivity σ dc =1.5 × 10–4 S/cm and average hopping frequency ν h = 1.5 × 107 Hz of charge carriers (mobile ions F−) at room temperature (293 K) have been defined from the σ dc (ν) experimental curves. Enthalpies of thermoactivated processes of ionic conductivity σ dc (T) (ΔHσ = 0.393 ± 0.005 eV) and dielectric relaxation ν h (T) (ΔHh = 0.37 ± 0.03 eV) coincide within their errors. A crystal-physical model of fluorine-ion transport in a Pb0.9Sc0.1F2.1 crystal lattice has been proposed. The characteristic parameters of charge carriers have been calculated: concentration nmob = 2.0 × 1021 cm−3, the distance of the hopping d ≈ 0.5 nm and mobility μmob = 4.5 × 10−7 cm2/s V (293 K).

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography “Crystallography and Photonics”, Russian Academy of Sciences, Moscow, Russia

    N. I. Sorokin

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  1. N. I. Sorokin
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Correspondence to N. I. Sorokin.

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Original Russian Text © N.I. Sorokin, 2018, published in Fizika Tverdogo Tela, 2018, Vol. 60, No. 4, pp. 710–714.

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Sorokin, N.I. A Crystal-Physical Model of Electrotransfer in the Superionic Conductor Pb1 – xSc x F2 + x (x = 0.1). Phys. Solid State 60, 714–718 (2018). https://doi.org/10.1134/S1063783418040327

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  • DOI: https://doi.org/10.1134/S1063783418040327

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