Rayleigh and Mandelstam–Brillouin Light Scattering in Chalcogenide Glasses of the (Sb2S3)x(GeS2)100–x System

Rayleigh and Mandelstam–Brillouin light scattering has been investigated in chalcogenide glasses of the Ge–Sb–S system along the (Sb2S3)х(GeS2)100–х set (х = 0–50 mol %). Propagation velocity of the longitudinal hypersound wave, the high-frequency longitudinal elastic modulus, the extinction coefficient at the wavelength λ = 0.6328 microns, and the Landau–Placzek ratio are determined. The Landau–Placzek ratio for the glassy alloys of the Ge–Sb–S system depends strongly on the average coordination number and becomes maximal at Z = 2.67.