Abstract
Phase equilibria in the quasi-ternary system Ag2S–SnS2–Sb2S3 in the section Ag2SnS3–AgSbS2 were studied for the first time by differential thermal, X-ray powder diffraction, and microstructural analyses and also by microhardness and density measurements. The system Ag2SnS3–AgSbS2 was found to be a quasi-binary section of the eutectic type; its state diagram was constructed. The coordinates of the eutectic are 30 mol % Ag2SnS3 and 700 K. Narrow regions of solid solutions based on the initial components were identified. The boundaries of the solid solutions at 300 K are 12 mol % AgSbS2 (on the side of Ag2SnS3) and 5 mol % Ag2SnS3 (on the side of AgSbS2). The solubility region at the eutectic temperature extends to 19 and 8 mol %, respectively. The solid solutions based on ternary sulfide Ag2SnS3 crystallize in the monoclinic system. With increasing AgSbS2 content, the monoclinic unit cell parameters increase from a = 6.270 Å, b = 5.793 Å, and c = 13.719 Å (for pure Ag2SnS3) to a = 6.278 Å, b = 5.799 Å, and c = 13.726 Å (for the alloy containing 12 mol % AgSbS2). These solid solutions are substitutional. The boundaries of the solid solutions were refined using the dependence of the Gibbs free energy on temperature and concentration within a modified version of the model of regular solutions.
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Mammadov, S.H., Mammadov, A.N. & Kurbanova, R.C. Quasi-Binary Section Ag2SnS3–AgSbS2. Russ. J. Inorg. Chem. 65, 217–221 (2020). https://doi.org/10.1134/S003602362001012X
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DOI: https://doi.org/10.1134/S003602362001012X