EFFECT OF GLASS PURITY ON THE GLASS STABILITY AND PHYSICAL-PROPERTIESOF GA-LA-S GLASSES

Gallium-lanthanum-sulphide (GLS) glasses, of composition (100 - x)Ga2S 3 . xLa(2)S(3) (mol%) have been produced. Two series have been investi gated: the first of H2S processed glasses, made from sulphides sourced from two different manufacturers, the second of GLS glasses produced from sulphide precursors of similar cationic purity, but varying anion ic impurity. The melting technique is shown to influence anionic impur ity. The level of impurity affects spectral response, density, thermal characteristics and glass-forming ability of the resultant glasses.