Extensive disorder occurs in the anion sublattice of PbF 2 above a temperature T C approximately=705K. The nature of this disorder has been studied using Raman scattering at high temperatures and also a simple theoretical model which takes account of the effects of anharmonicity and defect-induced scattering on the Raman spectrum. Quite good agreement is obtained between theory and experiment.
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Hayes et al. (1977) studied this question.
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