Incorporation of uranium in pyrochlore oxides and pressure-induced phase transitions

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dc.contributor.authorZhang, FXen_AU
dc.contributor.authorLang, Men_AU
dc.contributor.authorTracy, Cen_AU
dc.contributor.authorEwing, RCen_AU
dc.contributor.authorGregg, DJen_AU
dc.contributor.authorLumpkin, GRen_AU
dc.date.accessioned2016-11-07T04:50:28Zen_AU
dc.date.available2016-11-07T04:50:28Zen_AU
dc.date.issued2014-11-01en_AU
dc.date.statistics2016-11-07en_AU
dc.description.abstractUranium-doped gadolinium zirconates with pyrochlore structure were studied at ambient and high-pressure conditions up to 40 GPa. The bonding environment of uranium in the structure was determined by x-ray photoelectron and Raman spectroscopies and x-ray diffraction. The uranium valence for samples prepared in air is mainly U6+, but U4+ is present in pyrochlores fabricated in an argon atmosphere. Rietveld refinement of the XRD pattern suggests that uranium ions in pyrochlores are on the 16d site in 6-fold coordination with oxygen. At pressures greater than 22 GPa, the pyrochlore structure transformed to a cotunnite-type phase. The cotunnite high-pressure phase transformed to a defect fluorite structure on the release of pressure. © 2014 Elsevier Inc.en_AU
dc.identifier.citationZhang, F. X., Lang, M., Tracy, C., Ewing, R. C., Gregg, D. J., & Lumpkin, G. R. (2014). Incorporation of uranium in pyrochlore oxides and pressure-induced phase transitions. Journal of Solid State Chemistry, 219, 49-54. doi:10.1016/j.jssc.2014.07.011en_AU
dc.identifier.govdoc7579en_AU
dc.identifier.issn0022-4596en_AU
dc.identifier.journaltitleJournal of Solid State Chemistryen_AU
dc.identifier.pagination49-54en_AU
dc.identifier.urihttps://doi.org/10.1016/j.jssc.2014.07.011en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8037en_AU
dc.identifier.volume219en_AU
dc.language.isoenen_AU
dc.publisherElsevier - ScienceDirecten_AU
dc.subjectZirconatesen_AU
dc.subjectGadoliniumen_AU
dc.subjectRare earthsen_AU
dc.subjectUraniumen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectRaman spectroscopyen_AU
dc.titleIncorporation of uranium in pyrochlore oxides and pressure-induced phase transitionsen_AU
dc.typeJournal Articleen_AU
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