The character of interaction in the Dy-As-Se system

The nature of chemical interaction in the Dy-As-Se ternary system was examined across As2Se3-Dy, As2Se3-DySe, As2Se3-Dy2Se3 sections using comprehensive set of physicochemical analysis techniques. These included differential thermal analysis (DTA), X-ray powder diffraction (XRD), microstructural analysis (MSA), microhardness measurement and density determination. The boundaries of glass-forming regions in the systems were determined at different cooling rates: specifically quenching in air and in ice water. The observed increase in macroscopic properties suggest the formation of of new structural units in glassy state, in additional to the trigonal AsSe2/3 structural unit As2Se3 characteristic of the glass network. Formation of new structural units within the glassy phase. In the studied sections based on the glass-forming compound, a region of homogeneity was identified. Furthermore, an optimal synthesis regime for preparation of dysprosium-containing chalcogenide glasses was determined.