Preparation of Nanocrystalline Alumina under Hydrothermal Conditions |
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Authors: | O. V. Al’myasheva E. N. Korytkova A. V. Maslov V. V. Gusarov |
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Affiliation: | (1) Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, ul. Odoevskogo 24/2, St. Petersburg, 199155, Russia |
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Abstract: | Thermodynamic analysis of phase equilibria in the Al2O3-H2O system at temperatures from 120 to 380°C and pressures from 1 to 70 MPa is carried out, and the dehydration of aluminum hydroxide under hydrothermal conditions is studied experimentally. The results indicate that -AlOOH (boehmite), which commonly appears in experimental phase diagrams, is a nonequilibrium phase in these temperature and pressure ranges. The dehydration rate and mechanism are shown to strongly depend on the crystallinity of the parent aluminum hydroxide and the pressure in the hydrothermal system.__________Translated from Neorganicheskie Materialy, Vol. 41, No. 5, 2005, pp. 540–547.Original Russian Text Copyright © 2005 by Almyasheva, Korytkova, Maslov, Gusarov. |
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