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Comparison of Pedogenic and Sedimentary Greigite by X-ray Diffraction and Mössbauer Spectroscopy

Published online by Cambridge University Press:  28 February 2024

Helge Stanjek  and
Enver Murad
Helge Stanjek
Affiliation:
Lehrstuhl für Bodenkunde der Technischen, Universität München, D-85350 Freising-Weihenstephan, Germany
Enver Murad*
Affiliation:
Lehrstuhl für Bodenkunde der Technischen, Universität München, D-85350 Freising-Weihenstephan, Germany
*
*Present address: Bayerisches Geologisches Landesamt, Concordiastrasse 28, D-96049 Bamberg, Germany
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Abstract

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Greigites from a gley and a Tertiary sediment were investigated by X-ray diffraction and Mössbauer spectroscopy. The cell-edge length a of 9.8639 Å ± 0.0003 Å for the soil greigite was significantly smaller than that of the sedimentary greigite (9.8737 Å ± 0.0004 Å), but both cell-edge lengths were smaller than the value given on JCPDS card #16-713 (9.876 Å). Both greigites had 440 as strongest peak rather than 311 (as indicated on JCPDS card #16-713), but the other relative intensities did not deviate from the values given on this card within experimental error. Mean X-ray diffraction coherence lengths of 23 ± 2 nm for the soil greigite and of 60 ± 5 nm for the sedimentary greigite suggest superparamagnetic behavior. Mössbauer spectra nevertheless comprised two sextets with hyperfine fields of about 31.2 T (tetrahedral sites) and 30.7 T (octahedral sites), which resemble published values. It is postulated that aggregation may play an important role in determining the magnetic properties of the described samples.

Keywords

GreigiteMössbauerSedimentSoilXRD
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 4 , August 1994 , pp. 451 - 454
Copyright
Copyright © 1994, Clay Minerals Society

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