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Composition- and temperature-dependent phase transitions in 1:3 ordered perovskites Ba 4- x Sr x NaSb 3 O 12

Zhou, Qingdi; Kennedy, Brendan James; Elcombe, Margaret M; Withers, Raymond

Description

A series of 25 members of the 1:3 ordered perovskite family of the type Ba4-xSrxNaSb3O12 has been synthesized and their structures determined using synchrotron X-ray and neutron powder diffraction techniques. At room temperature the sample Ba4NaSb3O12 has a cubic structure in space group Im over(3, -) m with a=8.2821(1) Å, where the Na and Sb cations are ordered in the octahedral sites but there is no tilting of the (Na/Sb)O6 octahedra. As the average size of the A-site cation decreases,...[Show more]

dc.contributor.authorZhou, Qingdi
dc.contributor.authorKennedy, Brendan James
dc.contributor.authorElcombe, Margaret M
dc.contributor.authorWithers, Raymond
dc.date.accessioned2015-12-10T22:15:16Z
dc.identifier.issn0022-4596
dc.identifier.urihttp://hdl.handle.net/1885/50567
dc.description.abstractA series of 25 members of the 1:3 ordered perovskite family of the type Ba4-xSrxNaSb3O12 has been synthesized and their structures determined using synchrotron X-ray and neutron powder diffraction techniques. At room temperature the sample Ba4NaSb3O12 has a cubic structure in space group Im over(3, -) m with a=8.2821(1) Å, where the Na and Sb cations are ordered in the octahedral sites but there is no tilting of the (Na/Sb)O6 octahedra. As the average size of the A-site cation decreases, through the progressive replacement of Ba by Sr, tilting of the octahedra is introduced firstly lowering the symmetry to tetragonal in P4/mnc then to orthorhombic in Cmca and ultimately a monoclinic structure in P21/n as seen for Sr4NaSb3O12 with a=8.0960(2) Å, b=8.0926(2) Å, c=8.1003(1) Å and β=90.016(2)°. The powder neutron diffraction studies show that the orthorhombic and tetragonal phases in Cmca and P4/mnc co-exist at room temperature for samples with x between 1.5 and 2.
dc.publisherAcademic Press
dc.sourceJournal of Solid State Chemistry
dc.subjectKeywords: Barium compounds; Neutron diffraction; Perovskite; X ray powder diffraction; Monoclinic structure; Room temperature; Phase transitions 1:3 ordered perovskites; Synchrotron and neutron diffraction
dc.titleComposition- and temperature-dependent phase transitions in 1:3 ordered perovskites Ba 4- x Sr x NaSb 3 O 12
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume180
dc.date.issued2007
local.identifier.absfor030206 - Solid State Chemistry
local.identifier.ariespublicationu4217927xPUB206
local.type.statusPublished Version
local.contributor.affiliationZhou, Qingdi, University of Sydney
local.contributor.affiliationKennedy, Brendan James, University of Sydney
local.contributor.affiliationElcombe, Margaret M, Australian Nuclear Science and Technology Organisation
local.contributor.affiliationWithers, Raymond, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue11
local.bibliographicCitation.startpage3082
local.bibliographicCitation.lastpage3092
local.identifier.doi10.1016/j.jssc.2007.09.004
dc.date.updated2015-12-09T08:14:50Z
local.identifier.scopusID2-s2.0-36148935996
CollectionsANU Research Publications

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