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29Si and 27Al nuclear magnetic resonance spectroscopy of 2:1 clay minerals

Published online by Cambridge University Press:  09 July 2018

J. G. Thompson
J. G. Thompson*
Affiliation:
Geology Department, James Cook University of North Queensland, Townsville, Queensland 4811, Australia
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Abstract

Solid-state 29Si and 27Al NMR spectroscopy with magic-angle spinning was used to study two smectites, two illites and a vermiculite. 27Al NMR was able to directly observe the coordination of aluminium. 29Si NMR was sensitive to both the chemical nature of the interlayer species and the presence of aluminium in the tetrahedral sheet. Well-resolved resonances in the vermiculite at δ = −84·6, −88·7 and −92·9 (ppm relative to TMS) were assigned to Q3(2Al), Q3(1Al) and Q3(0Al) respectively. The smectites exhibited single resonances centred at δ = −93 (Q3(0Al)). The illites displayed broad resonances between δ = −80 and −105. The 29Si spectrum of a smectite complexed with alkylammonium cations showed a shielding of up to 1 ppm relative to the untreated sample.

Type
Research Article
Information
Clay Minerals , Volume 19 , Issue 2 , April 1984 , pp. 229 - 236
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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