Abstract
The electrical conductivity and 19F NMR spin-spin relaxation of single crystals of the anion-deficient solid solutions La 1−xBa xF 3−x (0 <× <0.095) have been investigated. In the temperature dependence of the conductivity a knee is observed, which is ascribed to exchange of fluoride ions between inequivalent sublattices. This is confirmed by spin-spin relaxation in pure LaF 3 and the solid solutions. Self-diffusion coefficients derived from the conductivity are in agreement with those from the spin-lattice relaxation time T 1ϱ in the rotating frame, indicating an absence of associates (Ba La V F) x above room temperature.
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