Oxygen potential measurement of U $_{0.85}$ Am $_{0.15}$ O $_{2}$ at 1473, 1573, and 1673 K

Watanabe, Masashi ; Yokoyama, Keisuke ; Vauchy, R. ; Kato, Masato ; Sugata, Hiromasa*; Seki, Takayuki*; Hino, Tetsushi*

Oxygen potential data of U $_{0.85}$ Am $_{0.15}$ O $_{2-x}$ were measured at 1473, 1573, and 1673 K by thermogravimetry. In U $_{1-y}$ An $_{y}$ O $_{2-x}$ , where An stands for Pu or Am, and for a given value of y and Oxygen/Metal ratio, the oxygen potential of U $_{1-y}$ Am $_{y}$ O $_{2-x}$ is higher than that of U $_{1-y}$ Pu $_{y}$ O $_{2-x}$ . The valence of cations in the hypostoichiometric region is similar to that of Nd-doped UO $_{2}$ . At the stoichiometric composition, it is estimated to be Am $^{3+}$ , U $^{4+}$ , and U $^{5+}$ (for charge compensation of Am $^{3+}$ ). The experimental data were analyzed using a defect chemistry model, and a relationship connecting the oxygen-to-metal ratio, the temperature, and the equilibrium oxygen partial pressure was proposed.

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	599
Number	:
Pages	:	p.155232_1 - 155232_5
Publication Year/Month	:	2024/10
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2024.155232
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	酸素ポテンシャル; O/M比; U-Am酸化物; 熱重量法; 核燃料
Research Facility	:	AGF(照射燃料試験施設)
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:	日立GEニュークリア・エナジー

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Registration No. : AA20230888
JAEA Abstracts No. : 52000705
Paper Submission No. : 28115

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Oxygen potential measurement of UAmO at 1473, 1573, and 1673 K

Oxygen potential measurement of U $_{0.85}$ Am $_{0.15}$ O $_{2}$ at 1473, 1573, and 1673 K