Floating-zone growth of brownmillerite Sr2Fe2O5 and the observation of a chain-ordered superstructure by single-crystal neutron diffraction

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dc.contributor.authorAuckett, JEen_AU
dc.contributor.authorStuder, AJen_AU
dc.contributor.authorSharma, Nen_AU
dc.contributor.authorLing, CDen_AU
dc.date.accessioned2014-03-25T23:57:24Zen_AU
dc.date.available2014-03-25T23:57:24Zen_AU
dc.date.issued2012-10-04en_AU
dc.date.statistics2014-03-26en_AU
dc.description.abstractWe report the first growth of a large (cm-scale) single crystal of the brownmillerite-type oxide ionic conductor Sr2Fe2O5, by the floating-zone method. Although the crystal is twinned on a microscopic scale with respect to the unit cell of the disordered oxygen-deficient perovskite from which it forms, this twinning is not complete or equivalent in all directions, and so it presents the possibility of direction-dependent measurements of conductivity and other properties. Single crystal neutron diffraction revealed a supercell with a doubled a axis, compared to the conventional lcmm model containing disordered left- and right-handed tetrahedral chains. It corresponds to the beta = 0, gamma = 1/2 case of the 12/m(0 beta gamma)0s chain-ordering modulation proposed by D'Hondt et al. on the basis of electron microscopy and electron diffraction evidence. Its observation by neutron diffraction for the first time proves that the tetrahedral chains are long-range ordered at room temperature, and in a more complex manner than the Ibm2 model, which has previously been assumed to describe local chain order. © 2012, Elsevier Ltd.en_AU
dc.identifier.citationAuckett, J. E., Studer, A. J., Sharma, N., & Ling, C. D. (2012). Floating-zone growth of brownmillerite Sr2Fe2O5 and the observation of a chain-ordered superstructure by single-crystal neutron diffraction. Solid State Ionics, 225, 432-436 (Special Issue SI). doi:10.1016/j.ssi.2012.01.005en_AU
dc.identifier.govdoc4570en_AU
dc.identifier.issn0167-2738en_AU
dc.identifier.issueSpecial Issue SIen_AU
dc.identifier.journaltitleSolid State Ionicsen_AU
dc.identifier.pagination432-436en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.ssi.2012.01.005en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5317en_AU
dc.identifier.volume225en_AU
dc.language.isoenen_AU
dc.publisherElsevier Science BVen_AU
dc.subjectCrystalsen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectNeutronsen_AU
dc.subjectElectron diffractionen_AU
dc.subjectElectronsen_AU
dc.subjectElectron microscopyen_AU
dc.subjectIonic conductivityen_AU
dc.titleFloating-zone growth of brownmillerite Sr2Fe2O5 and the observation of a chain-ordered superstructure by single-crystal neutron diffractionen_AU
dc.typeJournal Articleen_AU
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