The effect of lattice disorder on the low-temperature heat capacity of (U1−yThy)O2 and 238Pu-doped UO2

Journal article (2019)

Authors

S.O. Valu European Commission, Karlsruhe, RST/Applied Radiation & Isotopes - AS
Emanuele De Bona Université Paris-Saclay, European Commission, Karlsruhe
Karin Popa European Commission, Karlsruhe
Jean-Christophe Griveau European Commission, Karlsruhe
Eric Colineau European Commission, Karlsruhe
R. Konings European Commission, Karlsruhe
Research Group
RST/Reactor Physics and Nuclear Materials (AS) (TU Delft)
Copyright: © 2019 S.O. Valu, Emanuele De Bona, Karin Popa, Jean Christophe Griveau, Eric Colineau, R. Konings
DOI: https://doi.org/10.1038/s41598-019-51476-3
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Published Date

2019

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Reactor Physics and Nuclear Materials

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.

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