Quasibinar section of Ag₈SnS₆-Ag₃SbS₃ | Vestnik Tomskogo gosudarstvennogo universiteta. Chimia – Tomsk State University Journal of Chemistry. 2022. № 27. DOI: 10.17223/24135542/27/1

Quasibinar section of Ag₈SnS₆-Ag₃SbS₃

Silver thiostannates are promising inorganic materials with functional electrophysical properties. In connection with the search for promising new materials based on silver chalcogenides, the aim of this work is to study the quasibinary section Ag₈SnS₆-Ag₃SbS₃ of the four-component Ag-Sn-Sb-S system. Using complex methods of physicochemical analysis (differential thermal, X-ray phase, microstructural, microhardness measurement and density determination), phase equilibria in Ag₈SnS₆-Ag₃SbS₃ systems were studied and their T - x phase diagrams were constructed. It was shown that the Ag₈SnS₆-Ag₃SbS₃ system is a quasibinary section and belongs to a simple eutectic type with limited solubility regions based on the starting sulfides. The coordinates of the eutectic point: 25 mol.% Ag₈SnS₆ and T = 650K. The solubility based on Ag₈SnS₆ and Ag₃SbS₃ at eutectic temperature extends to 20 and 9 mol%, respectively. With decreasing temperature, solid solutions disintegrate and at 300K are 17 and 7 mol%. Solid solutions based on ternary sulfide Ag₈SnS₆ crystallize in rhombic syngony. With an increase in the Ag₃SbS₃ content, the rhombic lattice parameters increase from a = 15.298, b = 7.548, c = 10.699 Å (for pure Ag₈SnS₆) to a = 15.315, b = 7.567, c = 10.716 Å. These solid solutions are of the type of substitution. The boundaries of α (Ag₈SnS₆) and β (Ag₃SbS₃) solid solutions were refined using the temperature-concentration dependence of the Gibbs free energy in the framework of a modified version of the model of regula. Using the methods of physicochemical analysis (DTA, XRD, MSA) using thermodynamic calculations, a T-x phase diagram of the Ag₈SnS₆-Ag₃SbS₃ system was constructed. It was found that the Ag₈SnS₆-Ag₃SbS₃ section is of a simple eutectic type, with the coordinates of the eutectic point: 25 mol% Ag₈SnS₆ and 650K. The formation of narrow regions of solid solutions based on the starting components has been established. Contribution of the authors: the authors contributed equally to this article. The authors declare no conflicts of interests.

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Keywords

phase diagram, system, eutectic, solid solution, X-ray analysis, Ag₂S-SnS₂-Sb₂S₃

Authors

Name	Organization	E-mail
Mammadov Sharafat H.	Institute of Catalysis and Inorganic Chemistry named after Academician M.F. Nagiyev NAS of Azerbaijan	azxim@mail.ru
Ismailova Rena A.	Azerbaijan State University of Oil and Industry	renaismailova-10@mail.ru
Mammadov Asif N.	Institute of Catalysis and Inorganic Chemistry named after Academician M.F. Nagiyev NAS of Azerbaijan; Azerbaijan Technical University	asif.mammadov.47@mail.ru
Aliyev Soltan G.	Azerbaijan State University of Oil and Industry	saltan.aliyev@asoi.edu.az
Abdullaeva Soltan G.	Azerbaijan State University of Oil and Industry	gulnare-abdullayeva@rambler.ru
Gurbanova Almaz G.	Azerbaijan State University of Oil and Industry

Всего: 6

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