A study has been made of phase equilibria in the system A1₂O₃-H₂O. Results are expressed in the form of a pressure-temperature diagram, showing regions of stability for the crystalline phases gibbsite, boehmite, diaspore, and corundum. The diagram shows pressure and temperature minima (2,000 lb/in², 275∘ C.) for the stable existence of diaspore, and the significance of these data for the natural formation of diaspore is discussed.
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Ervine et al. (1951) studied this question.
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