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Infrared absorption of surface hydroxyl groups and lattice vibrations in lepidocrocite (γ-FeOOH) and boehmite (γ-AIOOH)

Published online by Cambridge University Press:  09 July 2018

D. G. Lewis  and
V. C. Farmer
D. G. Lewis
Affiliation:
Department of Soil Science, Waite Agricultural Research Institute, Glen Osmond 5064, South Australia
V. C. Farmer
Affiliation:
Department of Soil Science, Waite Agricultural Research Institute, Glen Osmond 5064, South Australia
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Abstract

Boehmite and lepidocrocite, in the form of thin plates with well-developed (010) faces parallel to the constituent layers, show one predominant absorption band due to OH stretching of two-coordinated surface hydroxyl groups, which are shown to be unreactive towards phosphate. In very fine grained preparations of lepidocrocite, two other species of surface hydroxyl are detected, presumably associated with (100) and (001) faces. Marked differences in the frequencies of bulk vibrations between platy and rod-shaped lepidocrocite preparations can be explained partly by their crystal morphology, and partly by degree of crystalline order.

Type
Research Article
Information
Clay Minerals , Volume 21 , Issue 1 , March 1986 , pp. 93 - 100
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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