Abstract
The symmetry-dependent structural differences and the fluoride-ion conductivity of the β-ErF3 crystal (the orthorhombic β-YF3 type) and the phase Er0.715Ca0.285F2.715 (the hexagonal tysonite modification α-LaF3) are revealed. A change in the β-YF3 structure type is caused by the partial replacement of Er3+ by Ca2+. It was shown that the contribution of Ca2+ to the conductivity of the phases R1 − yCayF3 − y is not limited to the creation of VF+ anion vacancies. The crystals of Er0.715Ca0.285F2.715 characterized by cation-composition heterogeneity have structural features (different from the vacancies in the anionic sublattice), which can exert a positive effect on the mobility of fluoride anions. This factor may play a more important role in ion transport than the concentration of anion vacancies.
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