The System AI2SiO5 at High Temperatures and Pressures |
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Authors: | R. C. DeVRlES |
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Affiliation: | Research Laboratory, General Electric Company, Schenectady, New York |
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Abstract: | Experiments on the system Al2SiO5 at high temperatures and pressures with the belt apparatus indicate that kyanite melts incongruently above about 1500°C at 25,000 bars to Al2O3 (corundum) plus liquid. The pressure-temperature curves obtained by starting with either a 1/1 Al2O3/SiO2 gel or with kyanite are essentially identical but differ considerably from the results with andalu-site and sillimanite. The structure of the starting material has considerable influence on the kinetics of the reaction and the metastable formation of corundum in this system. An "equilibrium" curve based on the andalusite-sillimanite data is described by P = 33.8 × 10-3T - 26.4 (Pin kbars, Tin°C). |
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