Crystal chemistry and structures of uranium-doped gadolinium zirconates

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dc.contributor.authorGregg, DJen_AU
dc.contributor.authorZhang, YJen_AU
dc.contributor.authorZhang, ZMen_AU
dc.contributor.authorKaratchevtseva, Ien_AU
dc.contributor.authorBlackford, MGen_AU
dc.contributor.authorTriani, Gen_AU
dc.contributor.authorLumpkin, GRen_AU
dc.date.accessioned2015-09-30T01:20:55Zen_AU
dc.date.available2015-09-30T01:20:55Zen_AU
dc.date.issued2013-07-01en_AU
dc.date.statistics2015-09-24en_AU
dc.description.abstractA series of uranium-containing gadolinium zirconate samples have been fabricated at 1450 °C in oxidizing, inert and reducing atmospheres. X-ray diffraction, Raman spectroscopy and transmission electron microscopy have been utilized to confirm adoption of pyrochlore or defect fluorite structures. X-ray diffraction allowed determination of the bulk averaged structure while Raman spectroscopy and transmission electron microscopy were used to determine ordering at the microdomain scale. Diffuse reflectance, X-ray absorption near edge structure and X-ray photoelectron spectroscopies indicated a predominantly U6+ oxidation state for all the air-sintered samples, even when Ca2+ or A-site vacancies were incorporated to charge balance for U4+, a mixed U5+/U6+ oxidation state was found for samples sintered in argon, while a mixed U4+/U5+ oxidation state occurred for sintering under N2–3.5%H2. This demonstrates a degree of uranium oxidation state control through sintering conditions, and the potential of using gadolinium zirconates as host materials for uranium in nuclear waste applications.© 2013, Elsevier B.V.en_AU
dc.identifier.citationGregg, D. J., Zhang, Y., Zhang, Z., Karatchevtseva, I., Blackford, M. G., Triani, G., Lumpkin, G. R., & Vance, E. R. (2013). Crystal chemistry and structures of uranium-doped gadolinium zirconates. Journal of Nuclear Materials, 438(1-3), 144-153. doi:10.1016/j.jnucmat.2013.03.007en_AU
dc.identifier.govdoc6109en_AU
dc.identifier.issn0022-3115en_AU
dc.identifier.issue1-3en_AU
dc.identifier.journaltitleJournal of Nuclear Materialsen_AU
dc.identifier.pagination144-153en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jnucmat.2013.03.007en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6270en_AU
dc.identifier.volume438en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectElectron microscopyen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectRaman spectroscopyen_AU
dc.subjectUraniumen_AU
dc.subjectRadioactive wastesen_AU
dc.subjectValenceen_AU
dc.titleCrystal chemistry and structures of uranium-doped gadolinium zirconatesen_AU
dc.typeJournal Articleen_AU
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