Abstract
Isothermal (670–700°C) solubility of corundum in supercritical water, within the stability range of corundum as a phase of the system Al 2O 3-H 2O, has been determined by the weight loss method. Experiments were performed in the pressure range 2.5 to 6 kbar in cold seal hydrothermal equipment at 670 ± 5° C using gold tubing. The overall uncertainty of the solubility values obtained was 8%. Experiments in the pressure range 10 to 20 kbar were performed in a piston cylinder apparatus at 700°C using sealed gold capsules held by supporting steel containers. The overall uncertainty of the solubility values obtained was estimated to be 10%. All data could be fitted by the linear equation S [ ppm Al 2 O 3] = −12.37 + 7.24 · p[ kbar ] with correlation coefficient r = 0.9963. Separate fits of hydrothermal and piston cylinder results yielded a small difference between the two data sets, which is due rather to the experimental uncertainty than to the small temperature difference.
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