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O. V. Samoilova, L. A. Makrovets, E. A. Trofimov
Thermodynamic
modeling of Cu2O–Na2O–K2O phase diagram
Abstract
Performed phase
equilibria thermodynamic modeling allowed to construct the phase diagram
liquidus boundaries for binary oxide Cu2O–Na2O, Cu2O–K2O,
K2O-Na2O systems by calculation, and also to construct
the ternary Cu2O–Na2O–K2O 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 Cu2O–Na2O
system were calculated for the temperature 1250 °C.
These activities are characterized by negative deviations from Raoult’s law.
Under modeling the KNaO compound melting heat and fusion entropy were
estimated. According to the calculations of the ternary Cu2O–Na2O–K2O
system phase diagram liquidus surface, the system is characterized by two
nonvariant equilibria.
Key words:
thermodynamic modeling, Cu2O–Na2O–K2O system,
KNaO compound, theory of subregular ionic solutions.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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