Formation and Structure of Chalcohalide Glasses in the As2Se3-AsTe-CuI System
As2Se3-AsTe-CuI系统玻璃的形成和结构研究

The aim of this study was to produce an infrared transmitting material with multiphonon absorption edge longer than 20pm. For this purpose, chalcohalide glasses based on As2Se3-AsTe-CuIsystem were studied. The glass forming region was obtained and homogeneous glass prepared. Binary system glass may be formed by combining As2Se3 with AsTe in any proportion, the maximumcontent of Cul in As2Se3 is up to 70 mol% and that of Cul in AsTe about 45 mol%. These glasseshave a good glass forming ability and it is easy to obtain the samples of diameter about 20mmand thickness over 50mm. The far infrared spectra of the glasses were investigated. The resultsdemonstrate that basic structural units are As(SeTe)3-xIx(x = 0 - 3), As2Te4] and CuI4], theirproportions depend on the composition of the glasses. With the help of experimental results andtheoretical analysis, a structural model of glasses was suggested.