Abstract :
Raman investigations were carried out for various compositions of chalcogenide glasses in the GeS2–Ga2S3–CdS system. Addition of Ga2S3 into GeS2 results in the formation of metal–metal bonds and edge-shared GaS4/2 tetrahedra. Ge2+ ions may surround [GaS4/2]1− tetrahedra acting as charge compensators. Upon the addition of CdS into the GeS2–Ga2S3 system, the number of the metal–metal bonds and edge-shared GaS4/2 tetrahedra decreases, resulting in the formation of corner-shared tetrahedra with non-bridging sulfurs (NBS). Cd2+ ions can be dissolved into the glass network as charge compensators for these NBS and exited few [GaS4/2]1− tetrahedra. The high solubility of CdS is ascribed to the dissociation of metal–metal bonds and edge-shared tetrahedra in these Ga-containing glasses.
