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

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022-01-14
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Mcode
Degree programme
Language
en
Pages
Series
Energies, Volume 15, issue 2
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 Ag1.2 Cu0.8 S (mineral mackinstryite) and AgCuS (mineral stromeyerite) were equilibrated through high-temperature reaction of the pure Cu2 S and Ag2 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 Ag2 S-Cu2 S system.
Description
Funding Information: This research was funded by the Academy of Finland project ?Thermodynamic investigation of complex inorganic material systems for improved renewable energy and metals production processes?, Decision number 311537, as part of the Johan Gadolin Process Chemistry Center activities at ?bo Akademi University. The APC was funded by ?bo Akademi University. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
Keywords
Copper, Inorganic materials, Ofofthethephase diagram arearescarcer, Particularly ininthetheAg2S-rich part, Phase diagram, Silver, Sulfide, Thermal analysis, Thermal energy, Thermochemistry, Thethelower temperatures
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Citation
Tesfaye , F , Lindberg , D , Sukhomlinov , D , Taskinen , P & Hupa , L 2022 , ' Thermal Analysis and Optimization of the Phase Diagram of the Cu-Ag Sulfide System ' , Energies , vol. 15 , no. 2 , 593 . https://doi.org/10.3390/en15020593