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Preparation of UO2, ThO2 and (Th,U)O2 pellets from photochemically-prepared nano-powders

Pavelková, Tereza and Čuba, Václav and de Visser-Týnová, Eva and Ekberg, Christian and Persson, Ingmar (2016). Preparation of UO2, ThO2 and (Th,U)O2 pellets from photochemically-prepared nano-powders. Journal of Nuclear Materials. 469, 57-61
[Journal article]

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Official URL: http://dx.doi.org/10.1016/j.jnucmat.2015.11.041

Abstract

Photochemically-induced preparation of nano-powders of crystalline uranium and/or thorium oxides and their subsequent pelletizing has been investigated. The preparative method was based on the photochemically induced formation of amorphous solid precursors in aqueous solution containing uranyl and/or thorium nitrate and ammonium formate. The EXAFS analyses of the precursors shown that photon irradiation of thorium containing solutions yields a compound with little long-range order but likely "ThO2 like" and the irradiation of uranium containing solutions yields the mixture of U(IV) and U(VI) compounds. The U-containing precursors were carbon free, thus allowing direct heat treatment in reducing atmosphere without pre-treatment in the air. Subsequent heat treatment of amorphous solid precursors at 300-550 C yielded nano-crystalline UO2, ThO2 or solid (Th,U)O2 solutions with high purity, well-developed crystals with linear crystallite size <15 nm. The prepared nano-powders of crystalline oxides were pelletized without any binder (pressure 500 MPa), the green pellets were subsequently sintered at 1300 C under an Ar:H2 (20:1) mixture (UO2 and (Th,U)O2 pellets) or at 1600 C in ambient air (ThO2 pellets). The theoretical density of the sintered pellets varied from 91 to 97%.

Authors/Creators:Pavelková, Tereza and Čuba, Václav and de Visser-Týnová, Eva and Ekberg, Christian and Persson, Ingmar
Title:Preparation of UO2, ThO2 and (Th,U)O2 pellets from photochemically-prepared nano-powders
Series/Journal:Journal of Nuclear Materials (0022-3115)
Year of publishing :2016
Volume:469
Page range:57-61
Number of Pages:5
Publisher:Elsevier
ISSN:0022-3115
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Restricted
Agris subject categories.:X Agricola extesions > X50 Chemistry
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 104 Chemical Sciences > Inorganic Chemistry
Agrovoc terms:pelleting, photochemical oxidants, UV radiation
Keywords:Nanoparticles, Uranium(IV) oxide, Thorium oxide, UV radiation, EXAFS, Pelletizing
URN:NBN:urn:nbn:se:slu:epsilon-e-3584
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3584
Additional ID:
Type of IDID
Web of Science (WoS)000370105200009
DOI10.1016/j.jnucmat.2015.11.041
ID Code:13548
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Chemistry and Biotechnology (140101-161231)
Deposited By: SLUpub Connector
Deposited On:11 Aug 2016 07:42
Metadata Last Modified:11 Aug 2016 07:42

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