RAMAN-SPECTRA OF GALLIUM SULFIDE BASED GLASSES

Raman investigation of glasses xGeS(2)-Ga2S3-yMCl, Ga2S3-2MCl (where M = Ag, Tl, Rb, Cs) and melt Ga2S3-2CsCl has been carried out for vario us x and y. Raman spectra have been interpreted in the frame of the mo del that gallium is fourfold coordinated in the chalcogenide/halide gl asses and forms complex anions such as [GaS3/2Cl](1-). Stability of th ese units and type of their interconnection (corner shared or edge sha red tetrahedra) depends on cation radius of a metal and correlates wit h glass-forming ability.