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Quantitative Measurement of Paramagnetic Fe3+ in Kaolinite

Published online by Cambridge University Press:  28 February 2024

Etienne Balan ,
Thierry Allard ,
Bruno Boizot ,
Guillaume Morin  and
Jean-Pierre Muller
Etienne Balan*
Affiliation:
Laboratoire de Minéralogie-Cristallographie, UMR 7590, CNRS, Universités Paris 6 et 7 and IPGP, Case 115, 4 Place Jussieu, 75252, Paris cedex 05, France
Thierry Allard
Affiliation:
Laboratoire de Minéralogie-Cristallographie, UMR 7590, CNRS, Universités Paris 6 et 7 and IPGP, Case 115, 4 Place Jussieu, 75252, Paris cedex 05, France
Bruno Boizot
Affiliation:
Laboratoire de Minéralogie-Cristallographie, UMR 7590, CNRS, Universités Paris 6 et 7 and IPGP, Case 115, 4 Place Jussieu, 75252, Paris cedex 05, France
Guillaume Morin
Affiliation:
Laboratoire de Minéralogie-Cristallographie, UMR 7590, CNRS, Universités Paris 6 et 7 and IPGP, Case 115, 4 Place Jussieu, 75252, Paris cedex 05, France
Jean-Pierre Muller
Affiliation:
Laboratoire de Minéralogie-Cristallographie, UMR 7590, CNRS, Universités Paris 6 et 7 and IPGP, Case 115, 4 Place Jussieu, 75252, Paris cedex 05, France Institut de Recherche pour le Développement (IRD), 213 rue Lafayette, 75480 Paris cedex 10, France
*
E-mail of corresponding author: [email protected]
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Abstract

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A method is proposed to measure the absolute concentration of paramagnetic Fe3+ ions in kaolinite from various geochemical environments using powder X-band electron paramagnetic resonance (EPR) data. An Fe3+-doped corundum sample is used as a concentration standard. The Fe3+ signal is calibrated by calculating the powder EPR spectra of Fe3+ ions in corundum and low-defect kaolinite. The paramagnetic Fe3+ concentration in other samples is obtained by an extrapolation procedure. This study provides a direct assessment of the iron distribution between isolated structural Fe3+ ions and other iron species, such as Fe3+ concentrated phases and Fe2+ ions. The concentration of isolated structural Fe3+ ranges between 200–3000 ppm and represents less than half of the total iron within kaolinite crystals.

Keywords

Electron Paramagnetic ResonanceEPRFe3+Kaolinite
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 4 , August 2000 , pp. 439 - 445
Copyright
Copyright © 2000, The Clay Minerals Society

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