Abstract
Phonon dispersion curves of two transition-metal carbides TaC and HfC have been derived from the three-body-force shell model (TSM). To account for the absence of the Lyddane-Sachs-Teller splitting between the long-wave optic-mode frequencies the model has to be so set as to give a zero value to the Lundqvist effective charge. The TSM results are found to agree well with the experimental curves of Smith and Glaser and are in this regard much better than the pseudopotential calculations of Mostoller and almost as good as the double-shell-model and the simple-screened-shell-model results of Weber for TaC and HfC, respectively.
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