Abstract
AbstractRaman spectra of (MY)x(Ga2S3)0.2−0.2x(GeS2)0.8−0.8xpseudo-ternary glassy systems (M = Na, K, Rb; Y = Cl, Br, I) were investigated systematically as a function of MY nature and alkali content. Raman spectroscopy of the Ga3S3-GeS2glassy matrix shows a complicated local structure: corner-sharing CS- and edge-sharing ES-GeS4/2tetrahedra, Ga-S triclusters and ETH-Ga2S6/2ethane-like units. The Ga2S6/2population decreases with increasingxrelated to a substitution of some bridging sulfur atoms around central Ga by terminal Y species with a respective decrease of the network rigidity. The formation of mixed Ga-(S,Y) environment is affected by the M+ion size and the MY concentration.
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