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Solid solution formation of lepidocrocite-boehmite and its occurrence in soil

Published online by Cambridge University Press:  09 July 2018

J. M. De Villiers  and
T. H. van Rooyen
J. M. De Villiers
Affiliation:
Department of Soil Science, University of Natal, Pietermaritzburg, South Africa
T. H. van Rooyen
Affiliation:
Department of Soil Science, University of Natal, Pietermaritzburg, South Africa
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Abstract

Addition of aluminium to the ferrous sulphate mother solution used to synthesize lepidocrocite, γ FeOOH, yielded a substituted, though excessively hydrous (Fe,Al)OOH structure. Apart from reducing X-crystallinity, the main effect of isomorphous incorporation of aluminium in the lepidocrocite lattice was a shift, to higher values, in the temperature at which the lepidocrocite dehydration to maghemite was complete. Increased thermal stability of this substituted lepidocrocite, deduced from measurements of magnetic attraction made after serial heating, was consistent with the presence of a boehmitic component in solid solution. Magnetic susceptibility data for an oxisol indicated that a similar ferri-aluminous complex had developed pedogenically in the upper solum. This constituent was, however, amorphous to X-rays.

Type
Research Article
Information
Clay Minerals , Volume 7 , Issue 2 , December 1967 , pp. 229 - 235
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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