As2Se3-AsTe-CuI系统玻璃的形成和结构研究

为了探索新的透红外材料，本文研究了As₂Se₃－AsTe－CuI系统玻璃的形成区，制备了一系列不同ASTe和CuI含量的玻璃．研究表明：该系统玻璃的形成范围相当大，AS₂Se₃－ASTe二元系统可以任何比例形成玻璃，AS₂Se₃－CuI和AsTe-CuI二元系统，当CSI含量分别达70和40mol％时，仍可形成稳定的玻璃，直径在20mm厚度在50mm以上的玻璃样品很容易得到．研究了部分玻璃样品的远红外光谱，结果表明：该系统玻璃的结构单元主要是：［AS（SeTe）_3-xI_x］（x＝0～3）、［As₂Te₄］和［CuI₄］，随玻璃的成分不同，这些结构单元的相对比例也不同，根据研究结果提出了该系统玻璃的结构模型．

Formation and Structure of Chalcohalide Glasses in the As2Se3-AsTe-CuI System

The aim of this study was to produce an infrared transmitting material with multiphonon absorption edge longer than 20μm. For this purpose, chalcohalide glasses based on As₂Se₃-AsTe-CuI system 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 maximum content of CuI in As₂Se₃ is up to 70 mol% and that of CuI in AsTe about 45 mol%. These glasses have a good glass forming ability and it is easy to obtain the samples of diameter about 20mm and thickness over 50mm. The far infrared spectra of the glasses were investigated. The results demonstrate that basic structural units are [As(SeTe)_3-xI_x(x=0～3), As₂Te₄] and [CuI_4], their proportions depend on the composition of the glasses. With the help of experimental results and theoretical analysis, a structural model of glasses was suggested.