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O. V. Samoilova, L. A. Makrovets, E. A. Trofimov

Thermodynamic modeling of Cu2OľNa2OľK2O phase diagram


Performed phase equilibria thermodynamic modeling allowed to construct the phase diagram liquidus boundaries for binary oxide Cu2OľNa2O, Cu2OľK2O, K2O-Na2O systems by calculation, and also to construct the ternary Cu2OľNa2OľK2O system liquidus surface. During this work the model parameter values were determined and applied to calculate the oxide melts activities of the investigation systems. The copper oxide and sodium oxide activities in the Cu2OľNa2O system were calculated for the temperature 1250 ░C. These activities are characterized by negative deviations from Raoultĺs law. Under modeling the KNaO compound melting heat and fusion entropy were estimated. According to the calculations of the ternary Cu2OľNa2OľK2O system phase diagram liquidus surface, the system is characterized by two nonvariant equilibria.
Key words: thermodynamic modeling, Cu2OľNa2OľK2O system, KNaO compound, theory of subregular ionic solutions.
Moscow University Chemistry Bulletin.
2018, Vol. 59, No. 3, P. 196

Copyright (C) Chemistry Dept., Moscow State University, 2002
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