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Electron spin resonance studies of doped synthetic kaolinite. I

Published online by Cambridge University Press:  09 July 2018

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

Synthetic kaolinites of varying crystallinity, and in some instances with ideal morphology, have been produced by hydrothermal reaction of aluminiosilicate gels. Synthetic kaolinites doped with Mg2+ and Fe3+ were also obtained.

Synthetic kaolinite doped with Fe3+ produced an ESR spectrum at g = 4 identical to spectra observed in natural kaolinites. Following X-irradiation and annealing at ~200°C, synthetic kaolinite doped with Mg2+ exhibited an ESR signal at g = 2·0 identical to a resonance observed in natural kaolinites. It is concluded that the g = 2·0 signal in kaolinite is due to a defect centre stabilized by Mg2+ substitution.

All synthetic and natural kaolinites exhibit an additional resonance at g = 2·0 following X-irradiation which can be repeatedly created and destroyed by irradiation and annealing. This resonance is attributed to defects possibly associated either with the substitution of Al3+ for Si4+ in kaolinite or with lattice vacancies.

Type
Research Article
Information
Clay Minerals , Volume 10 , Issue 4 , December 1974 , pp. 247 - 255
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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