Anisotropic lattice thermal expansion of uranium-based metallic fuels: A high-temperature X-ray diffraction study

We characterized the lattice parameter and phase transformation behaviors of six uranium-based metallic fuels in the temperature range 303–1173 K using in situ high-temperature X-ray diffraction (HT-XRD). In all of the fuels, α-U crystal structure almost vanished at 1023 K while UO2 crystal structur...

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Bibliographic Details
Published in:Journal of nuclear materials 2019-12, Vol.527, p.151803, Article 151803
Main Authors: Park, Jeongmi, Cho, Su Yeon, Youn, Young-Sang, Lee, Jeongmook, Kim, Jong-Yun, Park, Seo-Hyeon, Bae, Sang-Eun, Kuk, Seoung Woo, Park, Jeong-Yong, Rhee, Choong Kyun, Lim, Sang Ho
Format: Article
Language:English
Subjects:
Anisotropic lattice thermal expansion
Anisotropy
Crystal structure
Fuels
High temperature
HT-XRD
Lattice parameter
Lattice parameters
Metal fuels
Metallic fuel
Nuclear fuels
Phase transitions
Rare earth elements
Thermal expansion
Thermodynamic properties
Uranium
Uranium dioxide
U–Zr
X-ray diffraction
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Summary:We characterized the lattice parameter and phase transformation behaviors of six uranium-based metallic fuels in the temperature range 303–1173 K using in situ high-temperature X-ray diffraction (HT-XRD). In all of the fuels, α-U crystal structure almost vanished at 1023 K while UO2 crystal structure started forming at 843 K. Pawley refinement of HT-XRD data revealed anisotropic lattice thermal expansion with increases along the a- and c-axes upon annealing in all the metallic fuels. Furthermore, we confirmed that rare-earth elements (Nd, Ce, Pr, and La) contained in the U–10Zr metallic fuel hardly influenced the thermal behavior of the lattice parameters.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2019.151803