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The phonon dispersion curves and phonon density of states for silicon in the BC-8 structure have been calculated with the use of Weber's adiabatic-bond-charge model. All parameters were scaled in an unambiguous physical manner from Weber's values for silicon in the diamond structure. The frequency values at Γ agree to within 10% of those values available from Raman spectroscopy. The Γ₁^- mode is compatible with a transformation from the BC-8 structure to the wurtzite structure, a transformation that takes place upon heating the BC-8 polymorph.
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Goldberg et al. (1982) studied this question.
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