Abstract
Electroconduction of BaR2F8 crystals (R = Y0.9Er0.1, Y0.5Yb0.5, Er0.945Tm0.05Ho0.005) with the structure β-BaTm2F8 (monoclinic syngony, spatial group C2/m) is studied at 323–1073 K. Effect of partial pyrohydrolysis on the conduction of Ba(Y, Er)2F8 single crystals is investigated. Anion conductivity of crystals of Ba(Y, Yb)2F8 and Ba(Er, Tm, Ho)2F8 is measured at high temperatures. To a first approximation, there is no change in the ion transport mechanism in these crystals at elevated temperatures. Charge carriers in BaR2F8 crystals are, most probably, fluorine vacancies, and the anion conductivity reaches 1–2 mS cm–1 at 1073 K.
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