Abstract
The transmittance spectra in the region of the fundamental absorption edge are studied at 80 and 295 K for the single-crystal compounds FeIn2S4 and In2S3 and (FeIn2S4)1 − x(In2S3)x alloys grown by the Bridgman method. From the experimental spectra, the band gap of the FeIn2S4 and In2S3 compounds and (FeIn2S4)1 − x(In2S3)x alloys is determined. The dependence of the band gap on the composition parameter x of the alloy is constructed. It is established that the band gap nonlinearly varies with x and can be described by a quadratic dependence.
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