Lattice Vibrations in CdGa2S4

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Abstract
Raman scattering and polarized infrared reflection spectra are presented for CdGa2S4. CdGa2S4 has the defect chalcopyrite structure and is treated as a perturbation of the zincblende structure found in binaries such as GaP and ZnS. The points Γ, X and W in the reciprocal lattice space of the zincblende structure coincide with the point Γ of the chalcopyrite structure. Then, the characteristics observed in the spectra are interpreted as resulting from the transformation of the phonons at the points Γ X and W of the zincblende structure. Twelve of thirteen modes expected from irreducible representation are assigned and the static and optical dielectric constants are also calculated.

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