Oxygen potential of neodymium-doped U $_{0.817}$ Pu $_{0.180}$ Am $_{0.003}$ O $_{2 pm x}$ uranium-plutonium-americium mixed oxides at 1573, 1773, and 1873 K

Vauchy, R. ; Sunaoshi, Takeo*; Hirooka, Shun ; Nakamichi, Shinya ; Murakami, Tatsutoshi ; Kato, Masato

Oxygen potentials of U $_{0.817}$ Pu $_{0.180}$ Am $_{0.003}$ O $_{2 pm x}$ incorporating 10 and 20 mol% of neodymium (Nd/Metal) were investigated by thermogravimetry at 1573, 1773, and 1873 K. The presence of neodymium induced an increase in the oxygen potential of the U-Pu mixed oxide. The correlation between oxygen partial pressure pO $_{2}$ and deviation from stoichiometry x was analyzed, and a model of defect chemistry was proposed. Finally, the crystal structure of these mixed oxides was discussed at the light of the mechanisms of possible Nd(III)/U(V) charge compensation, and deviation from stoichiometry.

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	580
Number	:
Pages	:	p.154416_1 - 154416_11
Publication Year/Month	:	2023/07
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2023.154416
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Keywords	:	Oxygen Potential; O/M Ratio; Point Defects; SIM-fuel; Actinides; MOX Fuel; XRD; TGA
Research Facility	:	プルトニウム燃料製造施設
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Registration No. : AA20220931
JAEA Abstracts No. : 51000662
Paper Submission No. : 26583

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Oxygen potential of neodymium-doped UPuAmO uranium-plutonium-americium mixed oxides at 1573, 1773, and 1873 K

Oxygen potential of neodymium-doped U $_{0.817}$ Pu $_{0.180}$ Am $_{0.003}$ O $_{2 pm x}$ uranium-plutonium-americium mixed oxides at 1573, 1773, and 1873 K