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The ageing of sesquioxide gels. I. Iron oxide gels

Published online by Cambridge University Press:  14 March 2018

Robert C. Mackenzie  and
Robert Meldau
Robert C. Mackenzie
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen, Scotland
Robert Meldau
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen, Scotland
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Summary

The gels prepared by adding ammonium hydroxide rapidly to ferric chloride solutions to various pH values are shown to consist of amorphous material and crystalline goethite ; no other iron oxide was definitely identified in the present experiments, although this does not preclude other oxides being present in gels prepared under slightly different conditions. The goethite grows as acieular crystals on ageing at all pH values, but the rate of growth is greater at higher pit values. The exothermic peaks appearing on differential thermograms of such gels are apparently due to coalescence of extremely minute hematite particles to give larger particles, the sharpness of the peak indicating to some extent the size of the original hematite particles. These observations are related to data for other iron oxides, and the morphology of ferric oxide polymorphs under the electron microscope is considered.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 245 , June 1959 , pp. 153 - 165
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1959

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