Anomalous lattice parameter increase in alkali earth aluminium substituted tungsten defect pyrochlores

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dc.contributor.authorThorogood, GJen_AU
dc.contributor.authorKennedy, BJen_AU
dc.contributor.authorPeterson, VKen_AU
dc.contributor.authorElcombe, MMen_AU
dc.contributor.authorKearley, GJen_AU
dc.contributor.authorHanna, JVen_AU
dc.contributor.authorLuca, Ven_AU
dc.date.accessioned2009-07-07T05:56:31Zen_AU
dc.date.accessioned2010-04-30T05:03:53Zen_AU
dc.date.available2009-07-07T05:56:31Zen_AU
dc.date.available2010-04-30T05:03:53Zen_AU
dc.date.issued2009-03en_AU
dc.date.statistics2009-03en_AU
dc.description.abstractThe structures of the defect pyrochlores AAl(0.33)W(1.67)O(6) where A = K, Rb or Cs have been investigated using X-ray and neutron powder diffraction methods as well as the ab initio modelling program VASP The three cubic pyrochlores exhibit a non-linear increase in lattice parameter with respect to ionic radius of the A cation as a consequence of displacive disorder of the A-type cations. Solid state Al-27 MAS NMR studies of this pyrochlore system reveal shifts in the delta-21-22 ppm range that are indicative of pseudo-5 coordinate Al environments and emanate frorn distorted Al octahedral with one abnormally long Al. O bond. Solid state K-39, Rb-85, Rb-87 and Cs-133 MAS and static NMR Studies reflect the local cation disorder demonstrated in the structural Studies. © 2008, Elsevier Ltd.en_AU
dc.identifier.citationThorogood, G. J., Kennedy, B. J., Peterson, V. K., Elcombe, M. M., Kearley, G. J., Hanna, J. V., & Luca, V. (2009). Anomalous lattice parameter increase in alkali earth aluminium substituted tungsten defect pyrochlores. Journal of Solid State Chemistry, 182(3), 457-464. doi:10.1016/j.jssc.2008.11.014en_AU
dc.identifier.govdoc1254en_AU
dc.identifier.issn0022-4596en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleJournal of Solid State Chemistryen_AU
dc.identifier.pagination457-464en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jssc.2008.11.014en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1473en_AU
dc.identifier.volume182en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectLattice parametersen_AU
dc.subjectAlkaline earth metal compoundsen_AU
dc.subjectPyrochloreen_AU
dc.subjectTungstenen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectDiffuse scatteringen_AU
dc.titleAnomalous lattice parameter increase in alkali earth aluminium substituted tungsten defect pyrochloresen_AU
dc.typeJournal Articleen_AU
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