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On the microstructure and symmetry of apparently hexagonal BaAl 2 O 4

Larsson, Ann-Kristin; Withers, Raymond; Perez-Mato, J M; Fitz Gerald, John; Saines, Paul J.; Kennedy, Brendan James; Liu, Yun

Description

The P63 (a=2ap, b=2bp, c=cp) crystal structure reported for BaAl2O4 at room temperature has been carefully re-investigated by a combined transmission electron microscopy and neutron powder diffraction study. It is shown that the poor fit of this P63 (a=2ap, b=2bp, c=cp) structure model for BaAl2O4 to neutron powder diffraction data is primarily due to the failure to take into account coherent scattering between different domains related by enantiomorphic twinning of the P6322 parent...[Show more]

dc.contributor.authorLarsson, Ann-Kristin
dc.contributor.authorWithers, Raymond
dc.contributor.authorPerez-Mato, J M
dc.contributor.authorFitz Gerald, John
dc.contributor.authorSaines, Paul J.
dc.contributor.authorKennedy, Brendan James
dc.contributor.authorLiu, Yun
dc.date.accessioned2015-12-10T22:26:00Z
dc.identifier.issn0022-4596
dc.identifier.urihttp://hdl.handle.net/1885/53725
dc.description.abstractThe P63 (a=2ap, b=2bp, c=cp) crystal structure reported for BaAl2O4 at room temperature has been carefully re-investigated by a combined transmission electron microscopy and neutron powder diffraction study. It is shown that the poor fit of this P63 (a=2ap, b=2bp, c=cp) structure model for BaAl2O4 to neutron powder diffraction data is primarily due to the failure to take into account coherent scattering between different domains related by enantiomorphic twinning of the P6322 parent sub-structure. Fast Fourier transformation of [0 0 1] lattice images from small localized real space regions (∼10 nm in diameter) are used to show that the P63 (a=2ap, b=2bp, c=cp) crystal structure reported for BaAl2O4 is not correct on the local scale. The correct local symmetry of the very small nano-domains is most likely orthorhombic or monoclinic.
dc.publisherAcademic Press
dc.sourceJournal of Solid State Chemistry
dc.subjectKeywords: BaAl 2 O 4 ; Crystal structure; Neutron diffraction; Symmetry; TEM BaAl2O4; Crystal structure; Neutron diffraction; Symmetry; TEM
dc.titleOn the microstructure and symmetry of apparently hexagonal BaAl 2 O 4
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume181
dc.date.issued2008
local.identifier.absfor030206 - Solid State Chemistry
local.identifier.ariespublicationu4217927xPUB281
local.type.statusPublished Version
local.contributor.affiliationLarsson, Ann-Kristin, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationWithers, Raymond, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationPerez-Mato, J M, Universidad del Pais Vasco
local.contributor.affiliationFitz Gerald, John, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSaines, Paul J., University of Sydney
local.contributor.affiliationKennedy, Brendan James, University of Sydney
local.contributor.affiliationLiu, Yun, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue8
local.bibliographicCitation.startpage1816
local.bibliographicCitation.lastpage1823
local.identifier.doi10.1016/j.jssc.2008.03.043
dc.date.updated2015-12-09T09:29:03Z
local.identifier.scopusID2-s2.0-52649130249
local.identifier.thomsonID000259098000017
CollectionsANU Research Publications

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