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The ageing of sesquioxide gels. II. Alumina gels

Published online by Cambridge University Press:  14 March 2018

R. C. Mackenzie ,
R. Meldau  and
J. A. Gard
R. C. Mackenzie
Affiliation:
The Macaulay Institute for Soil Research, Aberdeen, Scotland
R. Meldau
Affiliation:
Carl-Bertelsmannstrasse 4, Gütersloh, Germany
J. A. Gard
Affiliation:
Department of Chemistry, University of Aberdeen, Scotland
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Summary

Aluminium oxides occur widely in soils and are of considerable pedological significance. The ageing of alumina gels, prepared from aluminium chloride and ammonia, into crystalline hydroxides has been investigated using thermal, X-ray, infra-red, and electron-microscope techniques. At room temperature ageing is more rapid at high pH values. The structure of the original gel particles appears to resemble boehmite and ageing causes the formation of bayerite with small amounts of gibbsite. The morphology of the various mineral types is considered and a mechanism of ageing suggested.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 257 , June 1962 , pp. 145 - 157
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1962

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