Title: Low temperature decomposition of U(IV) and Th(IV) oxalates to nanograined oxide powders
Authors: TYRPEKL VACLAVVIGIER JEAN-FRANCOISMANARA DarioWISS ThierryDIESTE BLANCO OLIVERSOMERS Joseph
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 460 p. 200 - 208
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2015
JRC N°: JRC92257
ISSN: 0022-3115
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC92257
DOI: 10.1016/j.jnucmat.2015.02.027
Type: Articles in periodicals and books
Abstract: Oxalate precipitation is a powerful technique for actinide oxide preparation at either laboratory or industrial scales. In this study we focused on the low temperature decomposition of Th(C2O4)2•2H2O and (N2H5)2U2(C2O4)5•nH2O into nanograined ThO2 and UO2 powders, which will be used later as precursors for the generation of materials emulating the nuclear fuel high burnup structure (HBS). The evolution with temperature of the nanoparticles properties has been investigated using several solid state analytical techniques (transmission and scanning electron microscopy, room and high temperature powder X-ray diffraction, Raman spectroscopy, thermogravimetry). Oxide powders with a high degree of crystallinity and grain size from ~10 nm were prepared. Their purity was examined with special focus on the presence of carbonates. It was found that carbonate content in the final powder did not exceed 3.4 wt.%, for the powder treated at 600°C for 1 hour.
JRC Directorate:Nuclear Safety and Security

Files in This Item:
There are no files associated with this item.


Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.