Raman Spectra of Solid Solutions (In₂S₃)_хꞏ(AgIn5S8)_1-х

Raman reflection spectra have been studied on single crystals of (In₂S₃)_хꞏ(AgIn₅S₈)_1–х solid solutions grown by vertical directional crystallization in the frequency range of 100–2000 cm^–1. It has been established that for this type of compounds, four active vibrational modes appear in the frequency range of 100–400 cm^–1. All vibrational modes were identified, and the crystal lattice type was determined. The full width at half maximum values were calculated, confirming the crystalline structure of the samples. Concentration dependences of the A₁g, E_g, 2F_2g modes were plotted. It was found that with a change in the solid solution composition, the vibrational modes exhibit a monotonic behavior – they smoothly shift with varying x from frequencies characteristic of AgIn₅S₈ to those characteristics of the In₂S₃ compound.

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