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Perturbation of Structural Fe3+ in Smectites by Exchange Ions

Published online by Cambridge University Press:  01 July 2024

M. B. McBride ,
T. J. Pinnavaia  and
M. M. Mortland
M. B. McBride
Affiliation:
Contribution from the Departments of Crop and Soil Sciences, Geology and Chemistry, Michigan State University, East Lansing, Michigan 48824, U.S.A.
T. J. Pinnavaia
Affiliation:
Contribution from the Departments of Crop and Soil Sciences, Geology and Chemistry, Michigan State University, East Lansing, Michigan 48824, U.S.A.
M. M. Mortland
Affiliation:
Contribution from the Departments of Crop and Soil Sciences, Geology and Chemistry, Michigan State University, East Lansing, Michigan 48824, U.S.A.
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Abstract

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The electron spin resonance of some structural Fe3+ for montmorillonites having low Fe3+ content, is perturbed by electrostatic interaction between exchange cations and structural charge sites. The position of charge centers of organic and inorganic cations in the interlayer can thus be determined at various levels of solvation. Dielectric media between the silicate layers lower the electrostatic attraction between the silicate and the exchange cations. The silicate charge appears to be partially delocalized on structural oxygen atoms as shown by electron spin resonance and i.r. spectroscopy. There is also evidence that divalent exchange cations on dehydrated montmorillonites cause hydrolysis of water; the protons so produced migrate to structural charge sites.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 2 , April 1975 , pp. 103 - 107
Copyright
Copyright © 1975, The Clay Minerals Society

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