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Article Dans Une Revue Scientific Reports Année : 2019

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

Résumé

The low-temperature heat capacity of (U 1− y Th y )O 2 and 238 Pu-doped UO 2 samples were determined using hybrid adiabatic relaxation calorimetry. Results of the investigated systems revealed the presence of the magnetic transition specific for UO 2 in all three intermediate compositions of the uranium-thorium dioxide ( y = 0.05, 0.09 and 0.12) and in the 238 Pu-doped UO 2 around 25 K. The magnetic behaviour of UO 2 exposed to the high alpha dose from the 238 Pu isotope was studied over time and it was found that 1.6% 238 Pu 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.

Dates et versions

hal-04468275 , version 1 (20-02-2024)

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Sorin-Octavian Vălu, Emanuele de Bona, Karin Popa, Jean-Christophe Griveau, Eric Colineau, et al.. The effect of lattice disorder on the low-temperature heat capacity of (U1−yThy)O2 and 238Pu-doped UO2. Scientific Reports, 2019, 9 (1), pp.15082. ⟨10.1038/s41598-019-51476-3⟩. ⟨hal-04468275⟩
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