Structures, phase transitions, hydration, and ionic conductivity of Ba4Nb2O9

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dc.contributor.authorLing, CDen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorKutteh, Ren_AU
dc.contributor.authorKharton, VVen_AU
dc.contributor.authorYaremchenko, AAen_AU
dc.contributor.authorFialkova, Sen_AU
dc.contributor.authorSharma, Nen_AU
dc.contributor.authorMacquart, RBen_AU
dc.contributor.authorHoelzel, Men_AU
dc.contributor.authorGutmann, MJen_AU
dc.date.accessioned2009-09-01T05:12:42Zen_AU
dc.date.accessioned2010-04-30T05:04:50Zen_AU
dc.date.available2009-09-01T05:12:42Zen_AU
dc.date.available2010-04-30T05:04:50Zen_AU
dc.date.issued2009-08-25en_AU
dc.date.statistics2009-08-25en_AU
dc.description.abstractBa4Nb2O9 is shown to have two basic polymorphs: a high-temperature γ phase, which represents an entirely new structure typed and a low-temperature (x phase, which has the rare Sr4Ru2O9 structure type. The phases are separated by a reconstructive phase transition at similar to 1370 K, the kinetics of which are sufficiently slow that the γ phase can easily be quenched to room temperature. Below similar to 950 K, both (α and γ phases absorb significant amounts of water. In the case of the γ phase, protons from absorbed water occupy ordered positions in the structure, giving rise to a stoichiometric phase γ-III-Ba4Nb2O9.1/3H(2)O at room temperature. γ-III-Ba4Nb2O9-1/3H(2)O partially dehydrates, at similar to 760 K to give another stoichiometric phase γ-II-Ba4Nb2O9.1/3H(2)O, which completely dehydrates at similar to 950 K to γ-I- Ba4Nb2O9. The hydrated γ phases exhibit faster protonic and oxide ionic transport than the hydrated (x phases because of the presence in the γ phases of 2D layers containing Nb5+ cations with unusually low oxygen coordination numbers (4 or 5) separated by discrete OH groups. Hydration appears to play an important role in stabilizing the γ phases at low temperatures, with the γ -> α transition oil reheating a quenched sample occurring at higher temperatures in humid atmospheres. © 2009, American Chemical Societyen_AU
dc.identifier.citationLing, C. D., Avdeev, M., Kutteh, R., Kharton, V. V., Yaremchenko, A. A., Fialkova, S., Sharma, N., Macquart, R. B., Hoelzel, M., & Gutmann, M. J.(2009). Structures, phase transitions, hydration, and ionic conductivity of Ba4Nb2O9. Chemistry of Materials, 21(16), 3853-3864. doi:10.1021/cm901644een_AU
dc.identifier.govdoc1316en_AU
dc.identifier.issn0897-4756en_AU
dc.identifier.issue6en_AU
dc.identifier.journaltitleChemistry of Materialsen_AU
dc.identifier.pagination3853-3864en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/cm901644een_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1789en_AU
dc.identifier.volume21en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectHydrationen_AU
dc.subjectIonic conductivityen_AU
dc.subjectPhase transformationsen_AU
dc.subjectNiobatesen_AU
dc.subjectBariumen_AU
dc.subjectMolecular structureen_AU
dc.titleStructures, phase transitions, hydration, and ionic conductivity of Ba4Nb2O9en_AU
dc.typeJournal Articleen_AU
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