Formation Of Complex Structural Units And Structure Of As-S-Se-Te-I Glasses

The dependence between the composition and structure of glasses was studied in the As-S-Se-Te-I system along the half double cut As(2)S(3-)AsSe(0.5)Te(0.5)I. Bulk samples were prepared from the high-purity elementary components by vacuum sealing the appropriate quantities inn quartz ampoules. The method of cascade heating, isothermal holding at selected temperatures and melt annealing in the air were used as a process of obtaining investigated samples. The far-infrared and Raman spectra of chalcogenides were recorded for various compositions and discussed in terms of the structural units involved. On the basis of spectral data it was established that the structure of glasses alloys (As(2)S(3))(100-x)(AsSe(0.5)Te(0.5)I)(x) is determined by the structure of the binary As(2)X(3) and ternary AsXI (X=S, Se or Te) glass-forming compounds.