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The mean square displacement (MSDS) of the ions in the perovskite KZnF 3 have been derived from neutron scattering measurements between 4 and 1073K. The results are compared with the values calculated in the quasi-harmonic approximation. In the high-temperature regime, only a slight increase of F - -ion anharmonicity is observed when approaching the melting point. Hence the drastic increase with temperature of the electrical conductivity observed for this compound around 983K does not seem to be due to the existence of a molten sublattice above this temperature. Nevertheless, a mechanism involving thermally generated ionic defects in the fluorine sublattice may be considered.
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Ridou et al. (1986) studied this question.
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