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The heat capacity of (U1−y[jls-end-space/]Npy[jls-end-space/])O2 solid solutions

The effect of Np substitution on the first-order transition at low concentration ((Formula presented) 0.05)

Journal Article (2026)
Author(s)

R. J.M. Konings (TU Delft - Applied Sciences, European Commission - Joint Research Centre)

E. Colineau (European Commission - Joint Research Centre)

J. C. Griveau (European Commission - Joint Research Centre)

K. Popa (European Commission - Joint Research Centre)

S. O. Vălu (European Commission - Joint Research Centre)

Research Group
RST/Reactor Physics and Nuclear Materials
DOI related publication
https://doi.org/10.1016/j.jpcs.2026.113623 Final published version
More Info
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Publication Year
2026
Language
English
Research Group
RST/Reactor Physics and Nuclear Materials
Journal title
Journal of Physics and Chemistry of Solids
Volume number
213
Article number
113623
Downloads counter
18
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Abstract

The low-temperature heat capacity and temperature-dependent DC magnetic susceptibility of neptunium-doped UO2 samples (U1−y[jls-end-space/]Npy[jls-end-space/])O2 with y = 0.01, 0.03 and 0.05 were measured. A strong effect was observed on the magnetic anomaly typical for UO2[jls-end-space/], both the Néel temperature and transition entropy. By comparison with data for other (U1−y[jls-end-space/], My[jls-end-space/])O2 solid solutions, it is suggested that this effect can be explained by the lattice strain resulting from substitution on the anion sublattice, and electron spin interaction.