Synthesis, structure, and stability of the high-temperature 6H-type perovskite phase Ba3BaSb2O9

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dc.contributor.authorLing, CDen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorAivazian, Ken_AU
dc.date.accessioned2008-04-28T02:37:13Zen_AU
dc.date.accessioned2010-04-30T05:02:54Zen_AU
dc.date.available2008-04-28T02:37:13Zen_AU
dc.date.available2010-04-30T05:02:54Zen_AU
dc.date.issued2007-08en_AU
dc.date.statistics2007-08en_AU
dc.description.abstractThe structure of Ba3BaSb2O9 is reported for the first time as a high-temperature phase with an ideal hexagonal BaTiO3-type structure (space group P6(3)/mmc) and Rietveld-refined against high temperature synchrotron X-ray powder diffraction data. The structure is remarkable for the extreme size difference between the pairs of face-sharing Sb5+O6 octahedra (with mean Sb - O bonds of 1.99 Å) and the single corner-sharing Ba2+O6 octahedra (with mean Ba - O bonds of 2.46 Å), which is greater than for any other reported 6H perovskite. This is consistent with the very different ionic radii of Sb5+ (0.60 Å) and Ba2+ (1.35 Å), and accounts for the instability of this phase at room temperature. The known symmetry-lowering modes of closely related 6H perovskites such as Ba3SrNb2O9 and Ba3SrTa2O9 are considered, but found not to account for the behaviour of Ba3BaSb2O9 on cooling from high temperatures. © 2007, International Union of Crystallographyen_AU
dc.identifier.citationLing, C. D., Avdeev, M., & Aivazian, K. (2007). Synthesis, structure, and stability of the high-temperature 6H-type perovskite phase Ba3BaSb2O9. Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 63(4), 584-588. doi.10.1107/S0108768107019441en_AU
dc.identifier.govdoc1184en_AU
dc.identifier.issn0108-7681en_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleActa Crystallographica Section B: Structural Science, Crystal Engineering and Materialsen_AU
dc.identifier.pagination584-588en_AU
dc.identifier.urihttp://dx.doi.org/10.1107/S0108768107019441en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1127en_AU
dc.identifier.volume63en_AU
dc.language.isoenen_AU
dc.publisherInternational Union of Crystallographyen_AU
dc.subjectTemperature rangeen_AU
dc.subjectSynthesisen_AU
dc.subjectStabilityen_AU
dc.subjectPerovskitesen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectSynchrotronsen_AU
dc.titleSynthesis, structure, and stability of the high-temperature 6H-type perovskite phase Ba3BaSb2O9en_AU
dc.typeJournal Articleen_AU
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