Abstract
Ionic mobility in solid solutions Pb0.9Bi0.1F2.1, Pb0.9In0.1F2.1, and Pb0.9Bi0.05In0.05F2.1 with the fluorite structure is studied with the 19F NMR method at 150–470 K. Temperature regions associated with local motions in the fluoride sublattice of these solid solutions are determined. The ratio of “fixed” (in the NMR scale) and mobile fluoride ions in the transition region (200-300 K) depends on the temperature, concentration of MF3 fluorides, and the nature of M3+ cations. Translational diffusion of fluoride ions is the predominant ionic motion in solid solutions above 300 K to cause high ionic conductivity in the samples.
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