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Concentration and mobility of charge carriers in the superionic conductor Ba_1-xLa_xF_2+x (0.05≤ x≤0.5)

Russian version

Sorokin N. I.¹

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

Email: nsorokin1@yandex.ru

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The frequency-temperature dependences of alternating current conductivity σ_ac(ν,T) for concentration series of single crystals of nonstoichiometric superionic conductor Ba_1-xLa_xF_2+x (0.05≤ x≤0.5) with the fluorite structure (sp. gr. Fm3 m) were investigated. The electrophysical measurements carried out in the frequency range 10^-1-10⁷ Hz and temperature range 210-409 K. From the analysis of the curves σ_ac(ν,T) we obtained the concentration dependences of conductivity σ_dc(x), average frequency of charge carrier jumps ν_h(x), enthalpies of activation of conductivity Δ H_σ(x) and hopping frequency Δ H_h(x). The mobility μ_mob(x) and concentration n_mob(x) of charge carriers (mobile interstitial ions F_mob^-) are calculated within the framework of crystallophysical model. The dependences σ_dc(x), n_mob(x) and μ_mob(x) are symbatic. It was found that contributions of the mobility μ_mob(x) and concentration n_mob(x) of charge carriers to the concentration dependence of the "room" conductivity σ_dc(x) of the Ba_1-xLa_xF_2+x superionic conductor were almost identical, when the composition changes from x=0.05 to x=0.5. Keywords: superionic conductivity, single crystals, barium and lanthanum fluorides, solid solutions, fluorite structure, point defects.

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