Synthesis and characterization of homogeneous (U,Am)O 2 and (U,Pu,Am)O 2 nanopowders.

Autor: Vigier JF; European Commission, Joint Research Centre (JRC) Karlsruhe Germany jean-francois.vigier@ec.europa.eu karin.popa@ec.europa.eu., Freis D; European Commission, Joint Research Centre (JRC) Karlsruhe Germany jean-francois.vigier@ec.europa.eu karin.popa@ec.europa.eu., Walter O; European Commission, Joint Research Centre (JRC) Karlsruhe Germany jean-francois.vigier@ec.europa.eu karin.popa@ec.europa.eu., Dieste Blanco O; European Commission, Joint Research Centre (JRC) Karlsruhe Germany jean-francois.vigier@ec.europa.eu karin.popa@ec.europa.eu., Bouëxière D; European Commission, Joint Research Centre (JRC) Karlsruhe Germany jean-francois.vigier@ec.europa.eu karin.popa@ec.europa.eu., Zuleger E; European Commission, Joint Research Centre (JRC) Karlsruhe Germany jean-francois.vigier@ec.europa.eu karin.popa@ec.europa.eu., Palina N; Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology P.O. 3640 D-76021 Karlsruhe Germany., Vitova T; Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology P.O. 3640 D-76021 Karlsruhe Germany., Konings RJM; European Commission, Joint Research Centre (JRC) Karlsruhe Germany jean-francois.vigier@ec.europa.eu karin.popa@ec.europa.eu., Popa K; European Commission, Joint Research Centre (JRC) Karlsruhe Germany jean-francois.vigier@ec.europa.eu karin.popa@ec.europa.eu.
Jazyk: angličtina
Zdroj: CrystEngComm [CrystEngComm] 2022 Aug 31; Vol. 24 (36), pp. 6338-6348. Date of Electronic Publication: 2022 Aug 31 (Print Publication: 2022).
DOI: 10.1039/d2ce00527a
Abstrakt: This paper details the first dedicated production of homogeneous nanocrystalline particles of mixed actinide oxide solid solutions containing americium. The target compositions were U 0.75 Pu 0.20 Am 0.05 O 2 , U 0.90 Am 0.10 O 2 and U 0.80 Am 0.20 O 2 . After successful hydrothermal synthesis and chemical characterisation, the nanocrystals were sintered and their structure and behaviour under self-irradiation were studied by powder XRD. Cationic charge distribution of the as-prepared nanocrystalline and sintered U 0.80 Am 0.20 O 2 materials was investigated applying U M 4 and Am M 5 edge high energy resolution XANES (HR-XANES). Typical oxidation states detected for the cations are U(iv)/U(v) and Am(iii)/Am(iv). The measured crystallographic swelling was systematically smaller for the as-synthesised nanoparticles than the sintered products. For sintered pellets, the maximal volumetric swelling was about 0.8% at saturation, in line with literature data for PuO 2 , AmO 2 , (U,Pu)O 2 or (U,Am)O 2 .
Competing Interests: The authors declare no conflict of interest.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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