Abstract
The Raman spectra of 2H–NbS2 and 2H–TaS2 have been analyzed in terms of a valence-force-field (VFF) model that incorporates four parameters. Analytic expressions for the Brillouin-zone-centre phonon frequencies have been obtained from the model and used in conjunction with the Raman frequencies to evaluate the four force constants for the two compounds. The results are compared with the known phonon spectra of similar compounds. The Raman spectrum of AgxTaS2 has also been investigated as a function of silver concentration x. Three new phonon modes appear in the Raman spectrum of AgxTaS2 with x < 1/3 and these new modes are attributed to a zone-folding mechanism. The plausibility of this interpretation has been investigated using phonon dispersion curves calculated from the VFF model.
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