Phase relations in the system of Al 2 O 3 -; h 2 O at high temperatures and pressures

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Abstract
The system Al 2 O 3 -H 2 O has been studied in the temperature range 100-600 degrees C. and at H 2 O pressures ranging from 5,000 to 40,000 atmospheres. At 40,000 atmospheres pressure the maximum temperature at which the trihydrate, gibbsite, is stable is 295 degrees . The monohydrate, diaspore, is stable at 40,000 atmospheres of H 2 O to a temperature of approximately 590 degrees . The relations of the polymorphs, diaspore and boehmite, are discussed and it is concluded that all boehmite forms metastably. The approximate slope of the boehmite-diaspore boundary, computed from thermodynamic data, indicates that diaspore in bauxite and clay deposits may have formed at atmospheric pressures and temperatures, a familiar conclusion from field observations.

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