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Oxygen diffusion in the fluorite-type oxides CeO$$_{2}$$, ThO$$_{2}$$, UO$$_{2}$$, PuO$$_{2}$$, and (U, Pu)O$$_{2}$$

蛍石型酸化物CeO$$_{2}$$, ThO$$_{2}$$, UO$$_{2}$$, PuO$$_{2}$$, and (U, Pu)O$$_{2}$$の酸素拡散

加藤 正人   ; 渡部 雅  ; 廣岡 瞬 ; Vauchy, R.  

Kato, Masato; Watanabe, Masashi; Hirooka, Shun; Vauchy, R.

This study evaluates oxygen self-diffusion and chemical diffusion coefficients of fluorite-type oxides CeO$$_{2}$$, ThO$$_{2}$$, UO$$_{2}$$, PuO$$_{2}$$, and (U, Pu) O$$_{2}$$ using point defect concentration, oxygen vacancies, and interstitial oxygen. The self-diffusion coefficient changed in proportion to the 1/n power of oxygen partial pressure, which is similar to the oxygen partial pressure dependence of the defect concentration. All parameters used to represent the diffusion coefficients were determined, and the experimental data were accurately stated. The chemical diffusion coefficient was much higher at O/M = 2.00 than in low O/M oxides. In the reduction process, the chemical diffusion control rate was dominant, and a new phase with O/M = 2.00 was formed, and it expanded from the surface in the oxidation process from a low O/M ratio to O/M = 2.00.

使用言語

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English

掲載資料名

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Frontiers in Nuclear Engineering (Internet)

巻

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1

号

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ページ数

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p.1081473_1 - 1081473_10

発行年月

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2023/01

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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MOX燃料; 酸素拡散係数

特許データ

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PDF

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論文URL

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https://doi.org/10.3389/fnuen.2022.1081473

研究データの公開先DOI

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使用施設

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プルトニウム燃料製造施設

広報プレスリリース

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論文解説記事
(成果普及情報誌)

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受委託・共同研究相手機関

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Access

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- Accesses

InCites™

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Altmetrics

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