Mazurets I. Phase equilibria and glassformation in quasy-ternary ВIIX - Ga2X3 - DIVX2 system (ВII - Zn, Cd, Hg; DIV - Gе, Sn; X - S, Se)

Vertical and isothermal sections, liquidus surface projections and view phase diagrams were constructed for HgS - Ga2S3 - GeS2, ZnSе - Ga2Sе3 - Ge(Sn)Sе2 systems using the results of differential thermal, X-ray phase and microstructure analysis. The glass-formation regions were determined in the quasi-ternary systems HgS - Ga2S3 - GeS2, ZnSе - Ga2Sе3 - GeSе2, Zn(Cd,Hg)Sе - Ga2Sе3 - SnSе2. Microhardness and characteristic temperatures were determined and reduced glass transition temperatures were calculated for glassy alloys of the investigated systems. Since the quasi-ternary systems BIISe - Ga2Se3 - DIVSe2, where BII - Zn, Cd, Hg, DIV - Ge, Sn are by now all investigated, a comparison of the nature of interaction and of the magnitudes of the glass-formation regions was performed. Considering the phase diagrams of these systems, one sees that the BIIX compounds have the greatest influence on the character of the phase equilibria. Based on the Raman spectroscopy of the glassy alloys of the HgS - Ga2S3 -GeS2 system, their likely structure was determined and the role of each atom in the glass structure depending on the composition was characterized. The existence of an interrelation between the structure of obtained glasses and the stable phase diagram of the system was concluded. It was shown that the glass structure changes upon the transition of the composition through the monovariant curves that separate the fields of primary crystallization of the phases.