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Noncrystalline Fe-Si-Al-Oxyhydroxides

Published online by Cambridge University Press:  02 April 2024

Richard A. Eggleton
Richard A. Eggleton*
Affiliation:
Department of Geology, Australian National University, Canberra, ACT 2600, Australia
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Abstract

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High-resolution transmission electron microscopy of noncrystalline Fe-Si-Al-oxyhydroxide gels shows a common structure of hollow packed spheres having external diameters ranging from 50 to 1000 Å. Some sphere walls display a concentric structure, particularly if the gel composition is close to that of a crystalline clay mineral (e.g., smectite, kaolin). The spheres probably formed by expansion of void space (bubbles) as the surrounding gel contracted 5–10% because of partial ordering of the Fe-Si-Al-oxygen network. Much of the water contained in such noncrystalline minerals is incorporated within the bubbles.

Keywords

GelsHigh-resolution transmission electron microscopyIronMorphologyNoncrystalline oxyhydroxides
Type
Research Article
Information
Clays and Clay Minerals , Volume 35 , Issue 1 , February 1987 , pp. 29 - 37
Copyright
Copyright © 1987, The Clay Minerals Society

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