ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Calculation of liquidus surfaces of CaSiO₃ in the CaO—FeO—SiO₂ and CaO—Fe₂O₃—SiO₂ systems

V. Daněk

Institute of Inorganic Chemistry, Centre for Chemical Research, Slovak Academy of Sciences, CS-842 36 Bratislava

Abstract: The activity of CaSiO₃ in CaO-FeO-SiO₂ and CaO-Fe₂O₃-SiO₂ melts was calcd. by using the approach similar to that used by R. Haase (1971). From the activity values, liquidus surfaces of CaSiO₃ were obtained by the Le Chatelier-Shreder equation. A structural analogy of the cryst. phase and the melt was assumed in the calcn. Good agreement of the calcd. phase diagrams with the exptl. ones was achieved when half of the Fe³⁺ present in the melt was tetrahedrally coordinated while the other half behaved as a network modifier. Tetrahedral coordination of a little part of the Fe²⁺ in the CaO-FeO-SiO₂ system cannot be excluded.

Full paper in Portable Document Format: 383a379.pdf

Chemical Papers 38 (3) 379–386 (1984)