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

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ID: 293049
1959
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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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Authors G. C. Kennedy
Journal american journal of science
Year 1959
DOI
10.2475/ajs.257.8.563
URL
https://ajs.scholasticahq.com/article/58768.pdf
Keywords Keywords not found

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