Title: Comparative XRPD and XAS study of the impact of the synthesis process on the electronic and structural environments of uranium–americium mixed oxides
Authors: PRIEUR DAMIENLEBRETON F.MARTIN PhilippeCAISSO MarieBUTZBACH R.SOMERS JosephDELAHAYE Thibaud
Citation: JOURNAL OF SOLID STATE CHEMISTRY vol. 230 p. 8 - 13
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Publication Year: 2014
JRC N°: JRC91103
ISSN: 0022-4596
URI: http://ac.els-cdn.com/S0022459615300049/1-s2.0-S0022459615300049-main.pdf?_tid=16deb8f4-2abf-11e5-b347-00000aab0f27&acdnat=1436943771_eef6e8e0b2ab8010beb41868aed760ef
http://publications.jrc.ec.europa.eu/repository/handle/JRC91103
DOI: 10.1016/j.jssc.2015.03.037
Type: Articles in periodicals and books
Abstract: Uranium-americium mixed oxides are potential compounds to reduce americium inventory in nuclear waste via a partitioning and transmutation strategy. A thorough assessment of the oxygen-to-metal ratio is paramount in such materials as it determines the important underlying electronic structure and phase relations, affecting both thermal conductivity of the material and its interaction with the cladding and coolant. In 2011, various XAS experiments on U1 xAmxO2±δ samples prepared by different synthesis methods have reported contradictory results on the charge distribution of U and Am. This work alleviates this discrepancy. The XAS results confirm that, independently of the synthesis process, the reductive sintering of U1 xAmxO2±δ leads to the formation of similar fluorite solid solution indicating the presence of Am+III and U+V in equimolar proportions.
JRC Directorate:Nuclear Safety and Security

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