Uranium-plutonium-oxygen phase diagram; Investigating the solvus of fluorite's exsolution

Vauchy, R. ; Hirooka, Shun ; Horii, Yuta ; Ogasawara, Masahiro*; Sunaoshi, Takeo*; Yamada, Tadahisa*; Tamura, Tetsuya*; Murakami, Tatsutoshi

The fluorite exsolution/recombination in U $_{1-y}$ Pu $_{y}$ O $_{2-x}$ (y = 0.30 and 0.45) and PuO $_{2-x}$ was investigated using differential scanning calorimetry. The results are in relatively good agreement with the literature data, except for plutonia. Our values indicate that the critical temperature of the miscibility gap in Pu-O is 3050 K lower than previously reported. Finally, the systematic experimental procedure allowed us refining the locus of the solvus existing in hypostoichiometric U $_{0.70}$ 0Pu $_{0.30}$ O $_{2-x}$ , U $_{0.55}$ Pu $_{0.45}$ O $_{2-x}$ , and PuO $_{2-x}$ dioxides.

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	599
Number	:
Pages	:	p.155233_1 - 155233_11
Publication Year/Month	:	2024/10
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2024.155233
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	MOX; Phase Separation; Nuclear Fuel; Phase Diagram; O/M Ratio; DSC
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Registration No. : AA20230820
JAEA Abstracts No. : 52000799
Paper Submission No. : 28215

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