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The structure of the kaolinite minerals — a FT-Raman study

Published online by Cambridge University Press:  09 July 2018

R. L. Frost
R. L. Frost*
Affiliation:
Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane Q4001, Australia
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Abstract

The Fourier transform Raman spectra of the kaolinite minerals have been measured in the 50–3800 cm−1 region using near infrared spectroscopy. Kaolinites are characterized by remarkably intense bands in the 120–145 cm−1 region. These bands, attributed to the O-Si-O and O-Al-O symmetric bending modes, are both polymorph and orientation dependent. The 200–1200 cm−1 spectral range is a finger-print region for clay minerals and each kaolinite clay has its own characteristic spectrum. The structure of clays is fundamentally determined by the position of hydroxyl groups. Fourier-transform Raman spectroscopy readily enables the hydroxyl stretching region to be examined allowing identification of the component bands. The advantages of FT-Raman spectroscopy are shown to enhance the study of the kaolinite structure.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 1 , March 1997 , pp. 65 - 77
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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