Neutron elastic and inelastic scattering studies have been made on single crystal samples of Pb 1-x Sn x Te (x=0.13, 0.20). Soft mode and Bragg peak intensity measurements gave no indication of the occurrence of a displacive phase transition. The energy widths of the soft TO phonons were observed to be strongly temperature dependent, ranging from approximately zero at liquid helium temperature to about 0.5 THz at room temperature.
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Daughton et al. (1978) studied this question.
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