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Published March 1966 | public
Journal Article

Liquid immiscibility in the system Na_2O-Al_2O_3-SiO_2-CO_2 at pressures to 1 kilobar

Abstract

A liquid miscibility occurs within the Quaternary system, Na_2O-Al_2O_3-SiO_2-CO_2 between Na_2 CO_3-rich liquids and NaAlSi_3O_8-rich liquids. The vapor-saturated liquidus surface does not intersect the miscibility gap at low pressures, but with increasing pressure it undergoes two discontinuous shifts toward the CO_2 apex of the tetrahedron, produced by carbonation reactions in the system Na_2O-SiO_2-CO_2. These position changes cause the vapor-saturated surface to intersect the miscibility gap. At 1 kilobar pressure on the join NaAlSi_3O_8-Na_2CO_3-CO_2, the two-liquid field occurs at temperatures above 870 degrees C.

Additional Information

© 1966 by American Journal of Science. We thank the National Science Foundation for supporting this work with Grant G 19588 and for covering publication charges with Grant GP-1870. The research and the manuscript have benefitted from our many discussions with G.W. Franz, A.J. Piwinskii, and D.H. Watkinson. Their assistance is gratefully acknowledged.

Additional details

Created:
August 22, 2023
Modified:
October 17, 2023