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dc.contributor.authorDunstan, MT-
dc.contributor.authorSouthon, PD-
dc.contributor.authorKepert, CJ-
dc.contributor.authorHester, JR-
dc.contributor.authorKimpton, JA-
dc.contributor.authorLing, CD-
dc.identifier.citationDunstan, M.T., Southon, P.D., Kepert, C.J., Hester, J., Kimpton, J.A., Ling, C.D. (2011). Phase diagram, chemical stability and physical properties of the solid-solution Ba(4)Nb(2-x)Ta(x)O(9). Journal of Solid State Chemistry, 184(10), 2648-2654. doi:10.1016/j.jssc.2011.07.036en_AU
dc.description.abstractThrough the construction of the Ba4Nb2−xTaxO9 phase diagram, it was discovered that the unique high-temperature γ phase is a thermodynamic intermediate between the low-temperature α phase (Sr4Ru2O9-type) and a 6H-perovskite. Refined site occupancies for the γ phase across the Ba4Nb2−xTaxO9 solid-solution indicate that Nb preferentially occupies the tetrahedral sites over the octahedral sites in the structure. When annealed in a CO2-rich atmosphere, all of the phases studied absorb large amounts of CO2 at high temperatures between ∼ 700 and 1300 K. In situ controlled-atmosphere diffraction studies show that this behaviour is linked to the formation of BaCO3 on the surface of the material, accompanied by a Ba5(Nb,Ta)4O15 impurity phase. In situ diffraction in humid atmospheres also confirms that these materials hydrate below ∼ 1273 K , and that this plays a critical role in the various reconstructive phase transitions as well as giving rise to proton conduction.(C) 2011 Elsevier Inc.en_AU
dc.publisherAcademic Press INC Elsevieren_AU
dc.subjectPhase diagramsen_AU
dc.subjectIonic conductivityen_AU
dc.subjectBarium oxidesen_AU
dc.titlePhase diagram, chemical stability and physical properties of the solid-solution Ba(4)Nb(2-x)Ta(x)O(9)en_AU
dc.typeJournal Articleen_AU
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