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Interpretation of Infrared Spectra of Oxidized and Reduced Nontronite

Published online by Cambridge University Press:  01 July 2024

J. W. Stucki  and
C. B. Roth
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Abstract

Infrared spectra of nontronite reveal shifts to lower wave, number in peaks located at 3570, 1030, and 821 cm-1, which are assigned to vibrational modes for O-H stretching, Si-Ob (basal oxygens) tetrahedral vibrations, and FeO-H deformation, respectively, as the Fe2+ content increases upon reduction. A pleochroic shoulder at 1110 cm-1 resulting from Si-Oa (apical oxygens) interactions appears to be unchanged with reduction. The absorption band at 848 cm-1 shifts to higher energy with reduction of structural iron, and persists at 840 cm-1 after complete deuteration of structural hydroxyls. The band is assigned to a Fe-OH mode where the OH moves as a unit. The shift in the Si-Ob mode to lower vibrational energy with reduction may indicate a decrease in stress forces between the tetrahedral and octahedral sheets.

Type
Research Article
Information
Clays and Clay Minerals , Volume 24 , Issue 6 , December 1976 , pp. 293 - 296
Copyright
Copyright © 1976 The Clay Minerals Society

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Footnotes

*

Journal Paper 6252, Purdue University, Agricultural Experiment Station, West Lafayette, IN 47907, U.S.A.

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