Abstract
In recent years, CdF2 has attracted considerable interest owing to its ability to be converted froni an insulator to a semiconductor. This convertibility is rendered possible by the thermal disorder of the lattice, consisting of Frenkel defects in the anion sublattice. Contrary to extended investigations of the low-temperature electrical and optical properties, data on high-temperature intrinsic ionic transport and defect structure in this crystal are still incomplete and controversial. In this paper, recent experimental results on ionic conductivity and self-diffusion in unconverted CdF2 are revised. We try to set limits to the probable values of the disorder parameters and show that some features of the results go beyond the reach of the classical theory of ionic transport in solids.
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