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Electron spin resonance studies of halloysites

Published online by Cambridge University Press:  09 July 2018

N. Chaikum  and
R. M. Carr
N. Chaikum
Affiliation:
Chemistry Department, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand
R. M. Carr
Affiliation:
Chemistry Department, Otago University, P.O. Box, 56, Dunedin, New Zealand
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Abstract

Absorption lines in the g ∼ 4 region of ESR spectra of three New Zealand halloysites were found to originate from similar paramagnetic centres as in kaolinites. Resonances in the g ∼ 4 region were not common to all the halloysites, although the signal at g = 2·0 for the Matauri Bay halloysite is probably due to a trapped positive hole or trapped ion. A 6-line resonance produced by Te Puke halloysite and removable by Na-saturation is attributed to exchangeable Mn on the clay surface. Low-temperature lines exhibited by all samples are due to V4+ or VO2+ replacing Al3+ in the octahedral sheet.

Type
Research Article
Information
Clay Minerals , Volume 22 , Issue 3 , September 1987 , pp. 287 - 296
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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