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

Sorin Octavian Vălu; Emanuele De Bona; Karin Popa; Jean Christophe Griveau; Eric Colineau; Rudy J.M. Konings

doi:10.1038/s41598-019-51476-3

The effect of lattice disorder on the low-temperature heat capacity of (U_1−yTh_y)O₂ and ²³⁸Pu-doped UO₂

Sorin Octavian Vălu^*, Emanuele De Bona, Karin Popa, Jean Christophe Griveau, Eric Colineau, Rudy J.M. Konings

^*Corresponding author for this work

RST/Applied Radiation & Isotopes

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Abstract

The low-temperature heat capacity of (U_1−yTh_y)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.

Original language	English
Article number	15082
Journal	Scientific Reports
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41598-019-51476-3
Publication status	Published - 2019

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

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 N{\'e}el 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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AU - Vălu, Sorin Octavian

AU - De Bona, Emanuele

AU - Popa, Karin

AU - Griveau, Jean Christophe

AU - Colineau, Eric

AU - Konings, Rudy J.M.

PY - 2019

Y1 - 2019

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AB - 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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The effect of lattice disorder on the low-temperature heat capacity of (U_1−yTh_y)O₂ and ²³⁸Pu-doped UO₂

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