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Electron spin resonance studies of doped synthetic kaolinite. II

Published online by Cambridge University Press:  09 July 2018

J. P. E. Jones ,
B. R. Angel  and
Peter L. Hall
J. P. E. Jones
Affiliation:
School of Mathematical Sciences, Plymouth Polytechnic, Plymouth PL4 8AA, Devon
B. R. Angel
Affiliation:
School of Mathematical Sciences, Plymouth Polytechnic, Plymouth PL4 8AA, Devon
Peter L. Hall
Affiliation:
School of Mathematical Sciences, Plymouth Polytechnic, Plymouth PL4 8AA, Devon
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Abstract

It is shown from studies of synthetic kaolinites doped with Fe3+ that the ESR spectrum of kaolinite at g = 4 consists of two components attributed to Fe3+ ions occupying two distinct substitutional sites (Centres I and II). The relative intensity of the two components can be correlated with the X-ray crystallinity of the samples. The ESR spectrum is influenced by artificial changes in crystallinity produced by subjecting samples to high stresses or by intercalation. It is concluded that Centre II is due to Fe3+ replacing Al3+ in the octahedral layer in a region of high crystallinity. Centre I is assigned to Fe3+ occupying Al3+ sites distorted by changes in the hydroxyl orientations associated with layer stacking disorder or disruption of interlayer bonding.

A stable defect centre in kaolinite which produces an ESR spectrum at g = 2·0 is attributed to either a hole centre located on an Si—O bond adjacent to an Mg2+ octahedral impurity or to an O2− ion trapped within the lattice.

Type
Research Article
Information
Clay Minerals , Volume 10 , Issue 4 , December 1974 , pp. 257 - 270
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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