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Mössbauer Spectroscopic Identification of Iron Oxides in Nontronite From Hohen Hagen, Federal Republic of Germany

Published online by Cambridge University Press:  02 April 2024

Paul R. Lear ,
Peter Komadel  and
Joseph W. Stucki
Paul R. Lear*
Affiliation:
Department of Agronomy, University of Illinois, Urbana, Illinois 61801
Peter Komadel*
Affiliation:
Department of Agronomy, University of Illinois, Urbana, Illinois 61801
Joseph W. Stucki
Affiliation:
Department of Agronomy, University of Illinois, Urbana, Illinois 61801
*
1Present address: Department of Chemistry, Michigan State University, East Lansing, Michigan 48824.
2Present address: Institute of Inorganic Chemistry, Center of Chemical Research, Slovak Academy of Sciences, 84236 Bratislava, Czechoslovakia.
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Abstract

Iron impurities in the Hohen Hagen nontronite (NG-1) were identified as maghemite and goethite. The phase identified as maghemite was magnetically ordered at both room temperature and 87 K, with hyperfine magnetic fields of 48.6 and 50.7 tesla, respectively. Due to the magnetic properties of this phase, it was easily separated from aqueous dispersions of the clay using a hand magnet. X-ray powder diffraction analysis revealed maghemite, quartz, and phyllosilicate in the magnetically separated phase. The impurity identified as goethite remained in the non-magnetic <2-μm fraction of the clay, displayed magnetic order only at 87 K (47.44 tesla hyperfine field), and accounted for about 8% of the total area of the Mössbauer spectrum.

Keywords

GoethiteIronMaghemiteMagnetic propertiesMössbauer spectroscopyNontronite
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 4 , August 1988 , pp. 376 - 378
Copyright
Copyright © 1988, The Clay Minerals Society

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