AbstractThe frequency (ν = 10^–1–107 Hz) dependences of electrical conductivity σ(ν) of single crystals of superionic conductor Pb_0.9Sc_0.1F_2.1 (10 mol % ScF_3) with fluorite type structure (CaF_2) 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 × 10^7 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 ) (Δ H _σ = 0.393 ± 0.005 eV) and dielectric relaxation ν_ h ( T ) (Δ H _h = 0.37 ± 0.03 eV) coincide within their errors. A crystal-physical model of fluorine-ion transport in a Pb_0.9Sc_0.1F_2.1 crystal lattice has been proposed. The characteristic parameters of charge carriers have been calculated: concentration n _mob = 2.0 × 10^21 cm^−3, the distance of the hopping d ≈ 0.5 nm and mobility μ_mob = 4.5 × 10^−7 cm^2/s V (293 K).
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Н. И. Сорокин (2018) studied this question.