Dispersion of refractive indices for (Cu1-xAgx)7GeS(Se)51 mixed crystals

М.М. Поп, Viktor I. Studenyak, Л. М. Сусліков, I.P. Studenyak, Tatiana A. Martianova, Oleksandr Khoshaba, Piotr Kisała, Bakhyt Yeraliyeva, Айнур Козбакова

2021

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DOI 10.1117/12.2613332

Data confidence 70 medium

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Abstract

(Cu1-хAgx)7GeS(Se)5I mixed crystals were grown by vertical zone crystallization method, they are shown to crystallize in cubic structure ( F43m space group, Z=4). Refractive indices for (Cu1-xAgx)7GeS(Se)5I mixed crystals were obtained from the spectral ellipsometry measurements. Two anomalies of refractive index in the spectrum region from 300 nm to 1000 nm are observed. One of them corresponds to the band-to-band optical transition while another one to the interband Van Hove-Phillips singularity. The dispersion dependences of refractive indices for (Cu1-хAgx)7GeS(Se)5I mixed crystals in the transparency region is well described by Wemple and DiDomenico model. The influence of the cation Cu→Ag substitution and anion S→Se substitution on the optical parameters of (Cu1-хAgx)7GeS(Se)5I mixed crystals has been investigated.