Kozak V. Phase equilibria of quasi-triple systems based on the compounds of AI2X, BIII2X3, R2X3, AIY (AI–Cu,Ag; BIII–Ga,In; R–Y,La,Pr,Ho,Er,Tm,Yb; X–S,Se; Y–Cl,Br,I) and properties of intermediate phases and glasses

The work is devoted to the study of phase equilibria, properties of intermediate phases and glasses in systems Cu2S(Se)–In2S(Se)3–CuI, Ga2S3–In2S3–La(Er)2S3, Ga2S3–La1,8Pr0,2S3–CuI, Ga2S3–La2S3–AgCl(Br,I). 6 Isothermal sections have been built for the first time Cu2S(Se)–In2S(Se)3–CuI, La(Er)2S3–Ga2S3–In2S3 (770 К), Ga2S3–La2S3–AgBr (670 К). 6 phase diagrams, 8 polythermal sections, 2 liquidus surface projections of the Cu2S(Se)–In2S(Se)3–CuI systems on the concentration triangle have been built. For the first time the regions of primary crystallization, types and the coordinations of the non- and monovariant equilibria have been found. For the first time, the existence of solid solutions La3Ga1,67-xInxS7, La3-xPr(Ho)xGa1,67S7, La3-xPrxIn1,67S7 has been established at 770 К according to the of X-ray analysis results. All samples have been indexed in hexagonal syngony, Sp. Gr. P63. For the first time, the structures of new phases Ga2,78In3,88Y3,35S15, Ga2,98In2,66Er4,37S15, Ga3,37In1,26Tm5,37S15, Ga3,46In1,58Yb4,96S15 have been established by single method. They crystallize in monoclinic syngony, Sp. Gr. C2/m in their own structural type. The crystal structures of the new CuGa2S(Se)3I, AgGa2Se3Cl(Br) compounds have been investigated by powder method. They crystallize in the tetragonal syngony, Sp. Gr. I-4 (structural type CuIn2Te3Cl). The X-ray diffraction method was the first to establish the glass formation region in the Ga2S3–La2S3–AgBr systems into the concentration triangle up to 5 mol.% AgBr and Ga2S3–La1,8Pr0,2S3–CuI extending inward concentration triangle up to 2 mol. % CuI. Optical absorption spectra of the glasses of the systems Ga2S3–La2S3–AgCl(I) with the compositions: 66-х mоl.% Ga2S3–30 mоl.% La2S3–4 mоl.% AgCl, х = 0; 1; 3 mоl.%; 67-х mоl.% Ga2S3–30 mоl.% La2S3–3 mоl.% AgI, х = 0; 0,75; 1,5 mоl.% have been obtained in the range of 4000-10500 Å. They show that the glasses are transparent in the visible range and contain narrow absorption bands in Erbium doped samples.