Clay Science
Online ISSN : 2186-3555
Print ISSN : 0009-8574
ISSN-L : 0009-8574
AN ELECTRON SPIN RESONANCE STUDY OF HALLOYSITES
KEINOSUKE NAGASAWA, HARUFUMI NORO
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Keywords: ESR, Halloysite, Fe content, Morphology
JOURNAL FREE ACCESS

1987 Volume 6 Issue 6 Pages 261-268

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Abstract

Electron spin resonance spectra were recorded for 13 halloysite samples of various geneses and morphologies. The spectra are similar to those of kaolinite. Signals near g=4 are due to Fe3+ at the octahedral sites of halloysite as confirmed by Fe determination after dithionite treatment. A very broad signal around g=2 is attributed to Fe minerals coexisting as impurities, and therefore ESR is useful in distinguishing between these two kinds of Fe.

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