Stability relations in the Al 2 O 3 -SiO 2 system calculated from solubilities in the Al 2 O 3 -Na 3 AlF 6 system

Details Stability relations in the Al 2 O 3 -SiO 2 system calculated from solubilities in the Al 2 O 3 -Na 3 AlF 6 system Stability relations in the Al 2 O 3 -SiO 2 system calculated from solubilities in the Al 2 O 3 -Na 3 AlF 6 system

Feb 1966

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..223w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 30, Issue 2, pp.223-237

Physics

15

Scientific paper

The solubilities of andalusite, kyanite, sillimanite, mullite, tridymite and quartz are measured in liquids of the Al 2 O 3 -SiO 2 -Na 3 AlF 6 system at 1010 and 800°C. It is shown that the Gibbs free energy of solid phases in the Al 2 O 3 SiO 2 - system can be simply related to the activity of silica in the liquid with which they are in equilibrium. When a SiO 2 is calculated according to the model of for fused salts the free energy relations in calories are as follows. At 1010°C; sillimanite andalusite, G = 75; sillimanite 1/3 (mullite + tridymit), G = 345; sillimanite corundum + tridymite, G = 1273. At 800°C; sillimanite andalusite, G = 24; sillimanite 1/3 (mullite + quartz), G = 598; sillimanite kyanite, G = 1293; sillimanitemanite corundum + quartz, G = 1341. A pressure-temperature phase equilibrium diagram is calculated for the solid portion of the Al 2 O 3 -SiO 2 system which gives a triple point, andalusitekyanite-sillimanite at approximately 410°C, 2400 bars. The P H 2 O - T equilibrium curve for the reaction muscovite + quartz K-feldspar + sillimanite + H 2 O is found to lie approximately 60-80°C below the curve for the simple breakdown of muscovite.

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