Abstract
An investigation has been carried out by 19F NMR on the Cd 1− x Bi x F 2+ x solid solution which is a fast fluorine ion conductor. The results are interpreted on hand of the existence of different fluoride sublattices and exchanges between them at rising temperature. The diffusive character of the mobile F − ions motion is shown above T ⋍ 350 K . The NMR study has allowed to justify the hypothesis of the formation of clusters of 2:2:2 type in Cd 1− x Bi x F 2+ x . Improvement with increasing x of the electrical conductivity above x ⋍ 0.05 may result mainly from the higher number of 2:2:2 clusters and consequently from that of the mobile anions.
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