Pronounced impact of atmospheric conditions on Ba4Nb2O9 and Ba4Ta2O9

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dc.contributor.authorDunstan, MTen_AU
dc.contributor.authorKimpton, JAen_AU
dc.contributor.authorKharton, VVen_AU
dc.contributor.authorLing, CDen_AU
dc.date.accessioned2013-09-18T23:46:05Zen_AU
dc.date.available2013-09-18T23:46:05Zen_AU
dc.date.issued2012-10-04en_AU
dc.date.statistics2013-09-19en_AU
dc.description.abstractBa(4)Nb(2)O(9) and Ba(4)Ta(2)O(9) decompose upon heating in a CO(2)-rich atmosphere. Here, we report further in situ synchrotron X-ray diffraction studies under CO(2)-free atmospheres of variable humidity and under vacuum and show that this strongly influences the reconstructive phase transitions normally seen. Under normal atmospheric conditions, alpha-Ba(4)Nb(2)O(9) transforms to gamma-Ba(4)Nb(2)O(9) at 1493 K and alpha-Ba(4)Ta(2)O(9) transforms to 6H-Ba(4)Ta(2)O(9) at 1513 K. Under wet argon, these transitions shift to lower temperatures of 1453 K and 1443 K for Ba(4)Nb(2)O(9) and Ba(4)Ta(2)O(9) respectively. Upon heating both the alpha samples under vacuum, no phase transition is observed at all up to 1723 K. Heating 6H-Ba(4)Ta(2)O(9) under vacuum saw the monoclinic -> hexagonal symmetry-transition temperature increase from 1050 K under air to 1700K. The significance of these observations in terms of possible practical applications of their mixed oxide ionic, protonic and electronic conduction properties are discussed. © 2012, Elsevier Ltd.en_AU
dc.identifier.citationDunstan, M. T., Kimpton, J. A., Kharton, V. V., & Ling, C. D. (2013). Pronounced impact of atmospheric conditions on Ba4Nb2O9 and Ba4Ta2O9. Solid State Ionics, 225, 172-175. doi:10.1016/j.ssi.2012.03.021en_AU
dc.identifier.govdoc5170en_AU
dc.identifier.issn0167-2738en_AU
dc.identifier.journaltitleSolid State Ionicsen_AU
dc.identifier.pagination172-175en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.ssi.2012.03.021en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4717en_AU
dc.identifier.volume225en_AU
dc.language.isoenen_AU
dc.publisherElsvier Science BVen_AU
dc.subjectPerovskiteen_AU
dc.subjectBarium oxidesen_AU
dc.subjectAtmosphericsen_AU
dc.subjectDiffractionen_AU
dc.subjectNiobiumen_AU
dc.subjectOxidesen_AU
dc.titlePronounced impact of atmospheric conditions on Ba4Nb2O9 and Ba4Ta2O9en_AU
dc.title.alternativeSolid State Ionics 18 Proceedings of the 18th International Conference on Solid State Ionics Warsaw, Poland, July 3 -8, 2011en_AU
dc.typeJournal Articleen_AU
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