Effect of Am addition on oxygen potential in (U $_{0.55}$ Pu $_{0.3}$ Am $_{0.15}$ )O $_{2-x}$

Yokoyama, Keisuke ; Watanabe, Masashi ; Usui, Akane; Seki, Takayuki*; Onishi, Takashi ; Kato, Masato

Oxygen potential of high Am content MOX, (U $_{0.55}$ Pu $_{0.3}$ Am $_{0.15}$ )O $_{2-x}$ , was measured at 1273 K, 1473 K, 1573 K, and 1623 K. by gas equilibrium method using thermogravimeter. Comparing the measured data with the literature data, it was found that the addition of 15% Am increases the oxygen potential of (U, Pu)O $_{2.00}$ by 100-150 kJ/mol for the same Pu content and O/M ratio. The proportion of cations in the stoichiometric composition was determined as (U $^{4+}_{0.4}$ U $^{5+}_{0.15}$ Pu $^{4+}_{0.3}$ Am $^{3+}_{0.15}$ )O $_{2.00}$ , assuming the presence of Am $^{3+}$ and partial oxidation of U $^{4+}$ to U $^{5+}$ . The relationship between oxygen partial pressure and deviation x from stoichiometry in (U $_{0.55}$ Pu $_{0.3}$ Am $_{0.15}$ )O $_{2-x}$ was analyzed by defect chemistry model. The equation to represent the O/M ratio was derived as a function of temperature and oxygen partial pressure. A part of this study includes the results of MEXT Innovative Nuclear Research and Development Program Grant Number JPMXD0219214921.

Language	:	English
Journal	:	Nuclear Materials and Energy (Internet)
Volume	:	42
Number	:
Pages	:	p.101908_1 - 101908_6
Publication Year/Month	:	2025/03
Meeting title	:
Held date	:
Location (city)	:
Location (country)	:
Patent information	:
PDF	:
Paper URL	:	https://doi.org/10.1016/j.nme.2025.101908
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	酸素ポテンシャル; Am含有MOX燃料; 熱重量法
Research Facility	:	AGF(照射燃料試験施設)
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:	文部科学省

Accesses	:	- Accesses
Web of Science® Times Cited Count	:	Times Cited Count： If you would like to get the latest times cited, please access the Web of Science®. http://www.webofknowledge.com/wos
InCites™	:	Percentile:0.00 Category:Nuclear Science & Technology
Altmetrics	:

Registration No. : AA20230880
JAEA Abstracts No. : 53000520
Paper Submission No. : 29300

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.

Effect of Am addition on oxygen potential in (UPuAm)O

Effect of Am addition on oxygen potential in (U $_{0.55}$ Pu $_{0.3}$ Am $_{0.15}$ )O $_{2-x}$