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Magnetic structure of greigite (Fe3S4) probed by neutron powder diffraction and polarized neutron diffraction

Record type: Article

We have investigated greigite (Fe3S4) using a combination of neutron powder diffraction and polarized neutron diffraction to give the first unambiguous assignment of its magnetic structure. Our results confirm that greigite has a collinear ferrimagnetic structure with antiferromagnetic coupling between the tetrahedral (A) and octahedral (B) sites. Our analysis also indicates that greigite does not have a significant vacancy concentration or spin canting. High-resolution neutron powder diffraction results enable determination of sublattice magnetizations of the A and B sites. At room temperature, the average magnetic moments on the two sites are almost the same (?3.0 ? B), with a net magnetic moment of ?3.0 ? B per formula unit (fu). The magnetic moment of the B sites decreases slightly between 10 K and room temperature, while the A site moment is relatively stable as a function of temperature; this indicates that greigite is probably an R-type ferrimagnet. At 10 K, the average magnetic moments of the A and B sites are 3.0 ? B and 3.25 ? B, respectively. Neutron diffraction measurements, coupled with magnetic measurements, on our pure synthetic greigite samples indicate that the saturation magnetization of greigite is lower than that of magnetite (Fe3O4). It is proposed that the lower magnetic moment in greigite (saturation magnetization is ?59 A m2 kg?1) compared to magnetite is probably caused by an increased degree of covalency between iron and sulfur compared to oxygen ligands or by greater delocalization of the 3d electrons in greigite.

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Citation

Chang, Liao, Rainford, Brian D., Stewart, J. Ross, Ritter, Clemens, Roberts, Andrew P., Tang, Yan and Chen, Qianwang (2009) Magnetic structure of greigite (Fe3S4) probed by neutron powder diffraction and polarized neutron diffraction Journal of Geophysical Research, 114, B07101. (doi:10.1029/2008JB006260).

More information

Submitted date: 17 December 2008
Published date: 11 July 2009

Identifiers

Local EPrints ID: 68602
URI: http://eprints.soton.ac.uk/id/eprint/68602
ISSN: 0148-0227
PURE UUID: 4ae3adbf-02c8-49c9-8b48-a243822c5a8a

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Date deposited: 03 Sep 2009
Last modified: 19 Jul 2017 00:18

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Contributors

Author: Liao Chang
Author: Brian D. Rainford
Author: J. Ross Stewart
Author: Clemens Ritter
Author: Andrew P. Roberts
Author: Yan Tang
Author: Qianwang Chen

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