Title: The effect of lattice disorder on the low-temperature heat capacity of (U1-yThy)O2 and 238Pu-doped UO2
Authors: VALU OCTAVIANDE BONA EMANUELEPOPA KARINGRIVEAU JEAN-CHRISTOPHECOLINEAU ERICKONINGS RUDY
Citation: SCIENTIFIC REPORTS vol. 9 p. 15082
Publisher: NATURE PUBLISHING GROUP
Publication Year: 2019
JRC N°: JRC116793
ISSN: 2045-2322 (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC116793
DOI: 10.1038/s41598-019-51476-3
Type: Articles in periodicals and books
Abstract: The low-temperature heat capacity of (U1−yThy)O2 and 238Pu-doped UO2 samples were determined using hybrid adiabatic relaxation calorimetry. Results of the investigated systems revealed the presence of the magnetic transition specific for UO2 in all three intermediate compositions of the uranium-thorium dioxide (y = 0.05, 0.09 and 0.12) and in the 238Pu-doped UO2 around 25 K. The magnetic behaviour of UO2 exposed to the high alpha dose from the 238Pu isotope was studied over time and it was found that 1.6% 238Pu affects the magnetic transition substantially, even after short period of time after annealing. In both systems the antiferromagnetic transition changes intensity, shape and Néel temperature with increasing Th-content and radiation dose, respectively, related to the increasing disorder on the crystal lattice resulting from substitution and defect creation.
JRC Directorate:Nuclear Safety and Security

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