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Infrared study of goethites of varying crystallinity and particle size: II. Crystallographic and morphological changes in series of synthetic goethites

Published online by Cambridge University Press:  09 July 2018

P. Cambier
P. Cambier*
Affiliation:
Station de Science du Sol, INRA, Route de St Cyr, 78000 Versailles, France
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Abstract

Low crystallinity of unsubstituted goethites is characterized by a small coherently diffracting domain, which may be accompanied by another type of disorder revealed by broader IR half-absorbance band widths. Inside the unit cell, the H-bond is weaker, which increases the OH stretching frequency and lowers the bending frequencies. Also, an increase in parameter a and a change in Fe-O bonds, which might correspond to a minor tilting of octahedra, occur along with a lowering of the frequency of the 630 cm−1 band.

Type
Research Article
Information
Clay Minerals , Volume 21 , Issue 2 , June 1986 , pp. 201 - 210
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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