Abstract
The temperature and concentration dependence of ionic conductivity (σ) have been studied on single crystals of Ba1−xRxF2+x (R=La, Ce, Nd, Gd, Tb, Dy, Ho, Tm, Lu; 0<x⩽0.40) nontoichiometric phases with the fluorite-type structure (Fm3m). In the temperature range 300−800 K the temperature dependence of the ionic conductivity obeys the Arrhenius equation. The observed ion transport parameters, and their concentration dependences of tre explained within the framework of the “defect regions” model suggested earlier by the present authors. The concentration of charge carriers (F−) and their mobility are calculated for Ba0.8R0.2F0.2 crystals. Thus for solid solutions with R=La, Ce, Pr we obtained n=1×1027 m−3, μ500K=1.3×10-11−5×10−11m2Vs, and for those with R=Gd, Tb, Ho, Tm we obtained n=5×1026m−12−2×10−11 m2/Vs.
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