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Synthesis and characterization of homogeneous (U,Am)O₂ and (U,Pu,Am)O₂ nanopowders

Vigier, Jean-François ; Freis, Daniel; Walter, Olaf; Dieste Blanco, Oliver ORCID iD icon; Bouëxière, Daniel; Zuleger, Evelyn; Palina, Natalia ORCID iD icon 1; Vitova, Tonya ORCID iD icon 1; Konings, Rudy J. M.; Popa, Karin
1 Institut für Nukleare Entsorgung (INE), Karlsruher Institut für Technologie (KIT)

Abstract:

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 $(U,Am)O_{2}$.


Verlagsausgabe §
DOI: 10.5445/IR/1000150593
Veröffentlicht am 12.09.2022
Originalveröffentlichung
DOI: 10.1039/d2ce00527a
Scopus
Zitationen: 11
Web of Science
Zitationen: 9
Dimensions
Zitationen: 11
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 1466-8033
KITopen-ID: 1000150593
HGF-Programm 32.11.03 (POF IV, LK 01) Fundamental Scientific Aspects
Erschienen in CrystEngComm
Verlag Royal Society of Chemistry (RSC)
Band 24
Heft 36
Seiten 6338-6348
Vorab online veröffentlicht am 31.08.2022
Nachgewiesen in Web of Science
Scopus
Dimensions
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