Formation and properties of chalcohalide glasses in the As2Se3-GeTe-CuI system

Chalcohalide glasses in the As2Se3-CeTe-CuI system have been prepared. Compositions cover the following range (mol%): As2Se3: 12-100, GeTe: 0-88, CuI: 0-70. Glasses are melted after being sealed at a pressure of about 10(-2) Pa and quenched in air. A broad glass-forming region was found based on this ternary system. Some physical properties are discussed in terms of structural variations with compositions. Measurements of glass transition temperature, T-g, microhardness, H-v, fracture toughness, K(I)c, and thermal expansion coefficient, alpha, were made. These parameters were found to be proportional to GeTe content. In the As2Se3-CuI glass system, CuI almost eliminated the As-O absorption band in the chalcogenide glasses. The infrared cut-off edges of the present samples were not affected by CuI doping and were mainly determined by Ge-Se or As-Se bonds with bands at 520 or 490 cm(-1). (C) 1997 Published by Elsevier Science B.V.