Thermal Analysis and Optimization of the Phase Diagram of the Cu-Ag Sulfide System

Fiseha Tesfaye, Daniel Lindberg, Dmitry Sukhomlinov, Pekka Taskinen and Leena Hupa
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Fiseha Tesfaye: Johan Gadolin Process Chemistry Centre, Abo Akademi University, Piispankatu 8, FI-20500 Turku, Finland
Daniel Lindberg: Department of Chemical and Metallurgical Engineering, Aalto University, Kemistintie 1, FI-02150 Espoo, Finland
Dmitry Sukhomlinov: Department of Chemical and Metallurgical Engineering, Aalto University, Kemistintie 1, FI-02150 Espoo, Finland
Pekka Taskinen: Department of Chemical and Metallurgical Engineering, Aalto University, Kemistintie 1, FI-02150 Espoo, Finland
Leena Hupa: Johan Gadolin Process Chemistry Centre, Abo Akademi University, Piispankatu 8, FI-20500 Turku, Finland

Energies, 2022, vol. 15, issue 2, 1-15

Abstract: Thermal stabilities of selected ternary phases of industrial interest in the Ag-Cu-S system have been studied by the calorimetric and electromotive force techniques. The ternary compounds Ag 1.2 Cu 0.8 S (mineral mackinstryite) and AgCuS (mineral stromeyerite) were equilibrated through high-temperature reaction of the pure Cu 2 S and Ag 2 S in an inert atmosphere. The synthesized single solid sample constituting the two ternary phases was ground into fine powders and lightly pressed into pellets before calorimetric measurements. An electrochemical cell incorporating the two equilibrated phase and additional CuS as a cathode material was employed. The measurement results obtained with both techniques were analyzed and thermodynamic properties in the system have been determined and compared with the available literature values. Enthalpy of fusion data of the Ag-richer solid solution (Ag,Cu) 2 S have also been determined directly from the experimental data for the first time. The thermodynamic quantities determined in this work can be used to calculate thermal energy of processes involving the Ag-Cu-S-ternary phases. By applying the obtained results and the critically evaluated literature data, we have developed a thermodynamic database. The self-developed database was combined with the latest pure substances database of the FactSage software package to model the phase diagram of the Ag 2 S-Cu 2 S system.

Keywords: sulfide; silver; copper; inorganic materials; thermal analysis; thermochemistry; thermal energy; phase diagram (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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