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The crystal and magnetic structures of LaCa 2 Fe 3 O 8 and NdCa 2 Fe 3 O 8

Hudspeth, Jessica; Goossens, Darren; Studer, Andrew J; Withers, Raymond; Noren, Lasse

Description

The crystal and magnetic structures of LaCa2Fe3O 8 and NdCa2Fe3O8 have been established using a combination of x-ray, neutron and electron diffraction. It was already considered likely that LaCa2Fe3O8 and NdCa2Fe3O8 were made up of stacked perovskite-like layers of FeO6 octahedra, with every third layer being replaced by a layer of tetrahedrally coordinated Fe, rather like a variation on the Brownmillerite (Ca2Fe2O5) structure type. We have gone further and determined a likely space group for...[Show more]

dc.contributor.authorHudspeth, Jessica
dc.contributor.authorGoossens, Darren
dc.contributor.authorStuder, Andrew J
dc.contributor.authorWithers, Raymond
dc.contributor.authorNoren, Lasse
dc.date.accessioned2015-12-10T22:32:38Z
dc.identifier.issn0953-8984
dc.identifier.urihttp://hdl.handle.net/1885/55854
dc.description.abstractThe crystal and magnetic structures of LaCa2Fe3O 8 and NdCa2Fe3O8 have been established using a combination of x-ray, neutron and electron diffraction. It was already considered likely that LaCa2Fe3O8 and NdCa2Fe3O8 were made up of stacked perovskite-like layers of FeO6 octahedra, with every third layer being replaced by a layer of tetrahedrally coordinated Fe, rather like a variation on the Brownmillerite (Ca2Fe2O5) structure type. We have gone further and determined a likely space group for this Grenier phase and determined the magnetic structure of the compounds at room temperature. The space group is found to be P 21ma (b axis as the long axis), and the crystal structure has been refined, subject to the stacking faulting along the long axis that is apparent in electron diffraction patterns. The magnetic structure of LaCa2Fe3O8 is shown to consist of antiferromagnetically ordered Fe3+ ions on a collinear G-type antiferromagnetic structure, with the magnetic moments most likely (anti)parallel with the c axis, and of magnitude 3.4 0.2μB (3.6 0.2μB for NdCa2Fe3O8). The result is reasonable given the magnetic structures of the end members of the La1-xCaxFeO3 series, LaFeO3 (x = 0) and Ca2Fe2O5 (x = 1).
dc.publisherInstitute of Physics Publishing
dc.sourceJournal of Physics: Condensed Matter
dc.subjectKeywords: Antiferromagnetic structures; Brown millerites; Crystal and magnetic structures; End-members; Long axis; Room temperatures; Space groups; Stacking faulting; Structure types; Antiferromagnetic materials; Antiferromagnetism; Calcium; Crystallography; Electr
dc.titleThe crystal and magnetic structures of LaCa 2 Fe 3 O 8 and NdCa 2 Fe 3 O 8
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume21
dc.date.issued2009
local.identifier.absfor020406 - Surfaces and Structural Properties of Condensed Matter
local.identifier.absfor030206 - Solid State Chemistry
local.identifier.ariespublicationu4217927xPUB342
local.type.statusPublished Version
local.contributor.affiliationHudspeth, Jessica, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGoossens, Darren, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationStuder, Andrew J, Australian Nuclear Science and Technology Organisation
local.contributor.affiliationWithers, Raymond, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationNoren, Lasse, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue12
local.bibliographicCitation.startpage124206/1
local.bibliographicCitation.lastpage8
local.identifier.doi10.1088/0953-8984/21/12/124206
dc.date.updated2016-02-24T10:42:36Z
local.identifier.scopusID2-s2.0-65449179915
local.identifier.thomsonID000263889900009
CollectionsANU Research Publications

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