{"title":"Effect of Am addition on oxygen potential in (U0.55Pu0.3Am0.15)O2−x","authors":"Keisuke Yokoyama , Masashi Watanabe , Akane Usui , Takayuki Seki , Takashi Onishi , Masato Kato","doi":"10.1016/j.nme.2025.101908","DOIUrl":null,"url":null,"abstract":"<div><div>Oxygen potential measurement was conducted at 1273 K, 1473 K, 1573 K, and 1623 K for (U<sub>0.55</sub>Pu<sub>0.3</sub>Am<sub>0.15</sub>)O<sub>2−x</sub> using a thermogravimeter and oxygen sensors. Adding 15% Am instead of U increased the oxygen potential of (U<sub>0.7</sub>Pu<sub>0.3</sub>)O<sub>2−x</sub> by 100 – 150 kJ/mol. The measured oxygen potentials were analyzed by the defect chemistry method. This analysis showed that the oxygen potential of (U<sub>0.55</sub>Pu<sub>0.3</sub>Am<sub>0.15</sub>)O<sub>2−x</sub> was formulated as a function of O/M ratio and temperature, and that the calculated results were consistent with the measured data. The cation valence is estimated to be (U<sup>4+</sup><sub>0.4</sub>U<sup>5+</sup><sub>0.15</sub>Pu<sup>4+</sup><sub>0.3</sub>Am<sup>3+</sup><sub>0.15</sub>)O<sub>2.00</sub> in the stoichiometric composition.</div></div>","PeriodicalId":56004,"journal":{"name":"Nuclear Materials and Energy","volume":"42 ","pages":"Article 101908"},"PeriodicalIF":2.7000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nuclear Materials and Energy","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2352179125000481","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/2/20 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Oxygen potential measurement was conducted at 1273 K, 1473 K, 1573 K, and 1623 K for (U0.55Pu0.3Am0.15)O2−x using a thermogravimeter and oxygen sensors. Adding 15% Am instead of U increased the oxygen potential of (U0.7Pu0.3)O2−x by 100 – 150 kJ/mol. The measured oxygen potentials were analyzed by the defect chemistry method. This analysis showed that the oxygen potential of (U0.55Pu0.3Am0.15)O2−x was formulated as a function of O/M ratio and temperature, and that the calculated results were consistent with the measured data. The cation valence is estimated to be (U4+0.4U5+0.15Pu4+0.3Am3+0.15)O2.00 in the stoichiometric composition.
期刊介绍：
The open-access journal Nuclear Materials and Energy is devoted to the growing field of research for material application in the production of nuclear energy. Nuclear Materials and Energy publishes original research articles of up to 6 pages in length.
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