Influence of water on the structure of anion deficient perovskites AA*(BB*) O 5.5 (A& A*= Sr 2+ or Ba 2+, B*= Sr2+, B= Nb 5+ or Ta 5+)

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dc.contributor.authorAwin, LAen_AU
dc.contributor.authorKennedy, BJen_AU
dc.contributor.authorAvdeev, Men_AU
dc.date.accessioned2021-07-27T02:21:35Zen_AU
dc.date.available2021-07-27T02:21:35Zen_AU
dc.date.issued2012-11-09en_AU
dc.date.statistics2021-07-26en_AU
dc.descriptionHard copy held in ANSTO Library at DDC 539.758/9en_AU
dc.description.abstractThe ordered defect niobates and tantalates perovskites have been extensively investigated, since the mechanism of water interaction and the proton chemical diffusions in the structure are critical in determining the electrical properties of such systems. The title double perovskites have a large concentration of oxygen vacancies in their face centred cubic structures. These vacancies can be occupied by protons creating a high ionic conductivity. In the present work, a new methodology processes for creating oxygen vacancies in the perovskites structure was investigated. Four members with representative formula AA*(B* B)O5.5 where A, A* and B* = Sr2+ or Ba2+and B = Nb5+ or Ta5+ have been successfully synthesised by two general methods. The methods were both solid state reactions but used different slurry medium, namely acetone and deionised water. The oxides were characterised by synchrotron X-ray diffraction, variable temperature X-ray diffraction, thermo gravimetric analysis and for the two samples BaSr2Nb05.5 and BaSr2Ta05.5 neutron powder diffraction. The XRD studies show that all the oxides form a cation ordered double perovskite structure. The thermo analysis measurements demonstrate a weight loss and an unusual thermal expansion upon heating for the compounds. The neutron diffraction patterns of BaSr2Nb05.5 and BaSr2NbO5.5 show a large diffuse background that is indicative of a high diffusion of oxygen vacancies in the structures, which confirms that the possibility of creating the oxygen vacancies by the wet method. Details of this structural study will be presented.en_AU
dc.identifier.citationAwin, L. A.; Kennedy, B. J.; Avdeev, M. (2012). Influence of water on the structure of anion deficient perovskites AA*(BB*) O 5.5 (A& A*= Sr 2+ or Ba 2+, B*= Sr2+, B= Nb 5+ or Ta 5+). Paper presented at 10th AINSE-ANBUG Neutron Scattering Symposium (AANSS) Sydney, NSW, Australia, 7-9 November.en_AU
dc.identifier.conferenceenddate9 November 2012en_AU
dc.identifier.conferencename10th AINSE-ANBUG Neutron Scattering Symposium (AANSS)en_AU
dc.identifier.conferenceplaceSydney, NSW, Australiaen_AU
dc.identifier.conferencestartdate7 November 2012en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11093en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Nuclear Science and Engineeringen_AU
dc.subjectAnionsen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectWateren_AU
dc.subjectProton conductivityen_AU
dc.subjectDiffusionen_AU
dc.subjectElectrical propertiesen_AU
dc.subjectPerovskitesen_AU
dc.titleInfluence of water on the structure of anion deficient perovskites AA*(BB*) O 5.5 (A& A*= Sr 2+ or Ba 2+, B*= Sr2+, B= Nb 5+ or Ta 5+)en_AU
dc.typeConference Abstracten_AU
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