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Concentration and mobility of charge carriers in the superionic conductor Ba1-xLaxF2+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 σac(ν,T) for concentration series of single crystals of nonstoichiometric superionic conductor Ba1-xLaxF2+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 σac(ν,T) we obtained the concentration dependences of conductivity σdc(x), average frequency of charge carrier jumps νh(x), enthalpies of activation of conductivity Δ Hσ(x) and hopping frequency Δ Hh(x). The mobility μmob(x) and concentration nmob(x) of charge carriers (mobile interstitial ions Fmob-) are calculated within the framework of crystallophysical model. The dependences σdc(x), nmob(x) and μmob(x) are symbatic. It was found that contributions of the mobility μmob(x) and concentration nmob(x) of charge carriers to the concentration dependence of the "room" conductivity σdc(x) of the Ba1-xLaxF2+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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