Abstract
Available experimental data (Raman and Infrared) on the optic phonon spectra in defect chalcopyrite crystals CdGa 2 Se 4 and CdGa 2 S 4 are used to determine the dynamical ionic effective charges. The results are compared with those found in other ternary compounds as spinels and chalcopyrites. An emperical correlation between the normalized Szigeti charges and the optical dielectric constant is discussed.
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