Alkali Halide-Doped Ga2S3-GeS2 Glasses

Glass-forming region, macroscopic properties, and electrical conductivity changes are systematically studied in the MY-Ga2S3-GeS2 systems, where M = Na, K, Rb and Y = Cl, Br, I, as a function of alkali concentration, MY chemical composition, and Ga2S3/GeS2 ratio using two composition lines: series A - (MY)(x)(Ga2S3)(0.2-0.2x)(GeS2)(0.8-0.8x) and series B - (MY)(x)(Ga2S3)(0.2 + 0.2x)(GeS2)(0.8-1.2x). Glasses of series B are characterized by higher maximum MY concentration, increasing with the cation radius up to 66.7 mol% in case of RbCl. The halide nature is found to be less significant for the vitrification ability. The density of samples varies monotonically between the two end-members of each series. Glass transition temperature decreases with increasing alkali concentration, ranging from 426 degrees C (x = 0) to 237 degrees C for (RbCl)(67)(Ga2S3)(33) sample. The conductivity of MY-Ga2S3-GeS2 glasses decreases with increasing cation radius. The Ga2S3/GeS2 ratio and the halide nature affect the conductivity weakly.