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Two Approaches to the Calculation of the Phase Diagrams Containing Congruently Melting Compounds Systems NaF—Na2SO4 and NaF—NaAlF4

V. Danielik, J. Gabčová, and P. Fellner

Department of Inorganic Technology, Faculty of Chemical Technology, Slovak University of Technology, SK-812 37 Bratislava


Abstract: Phase diagrams of the systems NaF-Na2SO4 and NaF-NaAlF4 (the systems containing compounds Na3FSO4 and/or Na3AlF6) were calculated using two different assumptions: i) The congruently melting compound (Na3FSO4 or Na3AlF6) completely dissociates. ii) The compound dissociates only partially. It is shown that both models are formal and as far as solidus-liquidus equilibria are concerned they yield approximately the same results. The model based on partial dissociation of the complex compound assuming the ideal behaviour of liquid phase is improper for description of the thermodynamic behaviour of the system.

Full paper in Portable Document Format: 534a233.pdf


Chemical Papers 53 (4) 233–237 (1999)

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