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Magnetic structure of greigite (Fe 3 S 4 ) probed by neutron powder diffraction and polarized neutron diffraction

Chang, Liao; Rainford, Brian D; Ross Stewart, J; Ritter, Clemens; Roberts, Andrew; Tang, Yan; Chen, Qianwang

Description

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...[Show more]

dc.contributor.authorChang, Liao
dc.contributor.authorRainford, Brian D
dc.contributor.authorRoss Stewart, J
dc.contributor.authorRitter, Clemens
dc.contributor.authorRoberts, Andrew
dc.contributor.authorTang, Yan
dc.contributor.authorChen, Qianwang
dc.date.accessioned2015-12-10T21:56:35Z
dc.identifier.issn0148-0227
dc.identifier.urihttp://hdl.handle.net/1885/39497
dc.description.abstractWe 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 μB), with a net magnetic moment of ∼3.0 μB 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 3.0μB and 3.25 μB 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 m 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 derealization of the 3d electrons in greigite.
dc.publisherAmerican Geophysical Union
dc.sourceJournal of Geophysical Research
dc.subjectKeywords: coupling; greigite; magnetic anomaly; magnetization; neutron diffraction; neutron probe; phreatic zone; polarization; spatial resolution; temperature effect
dc.titleMagnetic structure of greigite (Fe 3 S 4 ) probed by neutron powder diffraction and polarized neutron diffraction
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume114
dc.date.issued2009
local.identifier.absfor040406 - Magnetism and Palaeomagnetism
local.identifier.ariespublicationu4353633xPUB178
local.type.statusPublished Version
local.contributor.affiliationChang, Liao, University of Southampton
local.contributor.affiliationRainford, Brian D, University of Southampton
local.contributor.affiliationRoss Stewart, J, Insitut Laue-Langevin
local.contributor.affiliationRitter, Clemens, Insitut Laue-Langevin
local.contributor.affiliationRoberts, Andrew, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationTang, Yan, University of Science and Technology of China
local.contributor.affiliationChen, Qianwang, University of Science and Technology of China
local.description.embargo2037-12-31
local.bibliographicCitation.issue7
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage10
local.identifier.doi10.1029/2008JB006260
dc.date.updated2016-02-24T11:05:42Z
local.identifier.scopusID2-s2.0-70349656829
local.identifier.thomsonID000267937300004
CollectionsANU Research Publications

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