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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/8037

Title: Incorporation of uranium in pyrochlore oxides and pressure-induced phase transitions.
Authors: Zhang, FX
Lang, M
Tracy, C
Ewing, RC
Gregg, DJ
Lumpkin, GR
Keywords: ZIRCONATES
GADOLINIUM
RARE EARTHS
URANIUM
X-RAY DIFFRACTION
RAMAN SPECTROSCOPY
Issue Date: 1-Nov-2014
Publisher: Elsevier - ScienceDirect
Citation: Zhang, 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(0), 49-54. doi: http://dx.doi.org/10.1016/j.jssc.2014.07.011
Abstract: Uranium-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.
URI: http://ac.els-cdn.com/S0022459614003077/1-s2.0-S0022459614003077-main.pdf?_tid=9eb23064-a48d-11e6-a9ac-00000aacb35d&acdnat=1478484064_c997ad00fc0b8d2ab0696d7311cfb455
http://apo.ansto.gov.au/dspace/handle/10238/8037
ISSN: 0022-4596
Appears in Collections:Journal Articles

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