Zone-centered phonons of chalcopyrite crystals were examined and it was found that the energies of the highest-frequency B₂- and E-mode phonons coincide. These coincident phonons obey empirical correlations similar to those followed by zone-centered phonons of sphalerite crystals: (i) νTO²∝1μ, (ii) νLO²∝1μ, (iii) (νLO-νTO)νTO∝q*, and (iv) (νTOνLO)²∝q*2. These characteristic relations for II-IV-V₂ and I-III-VI₂ chalcopyrites are quantified and compared with those of binary sphalerite crystals.
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G. C. Bhar (1978) studied this question.
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