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Issues in the Energetics of Metastable Oxides and Oxyhydroxides

Published online by Cambridge University Press:  10 February 2011

Alexandra Navrotsky
Alexandra Navrotsky*
Affiliation:
Department of Geological and Geophysical Sciences and Princeton Materials Institute, Princeton University, Guyot Hall, Princeton, New Jersey 08544
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Abstract

In both low temperature materials synthesis (sol gel processing, chimie douce) and low temperature geochemistry (weathering, geothermal and hydrothermal reactions, diagenesis) metastable and/or poorly crystalline materials are encountered. Despite the lack of equilibrium, energetic considerations play a major role in the formation and transformation of such phases. Recent calorimetric studies on heats of formation of zeolites and related metastable frameworks, on nanophase alpha and gamma alumina, and on manganese oxides and hydroxides are summarized. These studies illustrate the effects of framework topology, cation content, hydration and surface energy on the formation, persistence, and eventual transformation to more stable phase assemblages of these environmentally important materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 432: Symposium S – Aqueous Chemistry and Geochemistry of Oxides , 1996 , 3
Copyright
Copyright © Materials Research Society 1997

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