Analysis of oxygen potential of (U0.7Pu0.3)O2±x and (U0.8Pu0.2)O2±x based on point defect chemistry

Masato Kato, Kenji Konashi, Nobuo Nakae

研究成果: Article

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Stoichiometries in (U0.7Pu0.3)O2±x and (U0.8Pu0.2)O2±x were analyzed with the experimental data of oxygen potential based on point defect chemistry. The relationship between the deviation x of stoichiometric composition and the oxygen partial pressure PO2 was evaluated using a Kröger-Vink diagram. The concentrations of the point defects in uranium and plutonium mixed oxide (MOX) were estimated from the measurement data of oxygen potentials as functions of temperature and PO2. The analysis results showed that x was proportional to PO2± 1 / 2 near the stoichiometric region of both (U0.7Pu0.3)O2±x and (U0.8Pu0.2)O2±x, which suggested that intrinsic ionization was the dominant defect. A model to calculate oxygen potential was derived and it represented the experimental data accurately. Further, the model estimated the thermodynamic data, Δ over(H, -)O2 and Δ over(S, -)O2, of stoichiometric (U0.7Pu0.3)O2.00 and (U0.8Pu0.2)O2.00 as -552.5 kJ·mol-1 and -149.7 J·mol-1, and -674.0 kJ · mol-1 and -219.4 J · mol-1, respectively.

元の言語English
ページ(範囲)164-169
ページ数6
ジャーナルJournal of Nuclear Materials
389
発行部数1
DOI
出版物ステータスPublished - 2009 5 15

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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