Oxygen potential of hypo-stoichiometric La-doped UO2

Keita Yoshida, Tatsumi Arima, Yaohiro Inagaki, Kazuya Idemitsu, Masahiko Osaka, Shuhei Miwa

Research output: Contribution to journalArticle

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Abstract

The oxygen potential of hypo-stoichiometric (U0.8La 0.2)O2-x was measured as a function of oxygen-to-metal ratio (2 - x) in the temperature range from 1173 K to 1473 K. Compared with uranium oxides doped with other lanthanides, e.g. Lu, Er, Gd and Nd, the relationship between ΔGO2 and the oxygen-to-metal ratio obtained for this sample showed almost the same trend, and for the relatively large oxygen non-stoichiometry x, its significance was comparable with that of (U0.8Gd0.2)O2-x. However, the detailed variation of ΔHO2 and ΔSO2 was different among these uranium oxides, especially in the near O/M = 2.0 region. Furthermore, the oxygen defect structure was evaluated from the relationship between log PO2 and log x, and ΔGO2 value of lanthanide-doped uranium oxide was discussed in terms of lanthanide ionic radius.

Original languageEnglish
Pages (from-to)22-26
Number of pages5
JournalJournal of Nuclear Materials
Volume418
Issue number1-3
DOIs
Publication statusPublished - Nov 1 2011

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uranium oxides
Lanthanoid Series Elements
Oxygen
Rare earth elements
Uranium
oxygen
Oxides
Metals
Defect structures
metals
trends
radii
defects
uranium oxide
Temperature
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Oxygen potential of hypo-stoichiometric La-doped UO2. / Yoshida, Keita; Arima, Tatsumi; Inagaki, Yaohiro; Idemitsu, Kazuya; Osaka, Masahiko; Miwa, Shuhei.

In: Journal of Nuclear Materials, Vol. 418, No. 1-3, 01.11.2011, p. 22-26.

Research output: Contribution to journalArticle

Yoshida, Keita ; Arima, Tatsumi ; Inagaki, Yaohiro ; Idemitsu, Kazuya ; Osaka, Masahiko ; Miwa, Shuhei. / Oxygen potential of hypo-stoichiometric La-doped UO2. In: Journal of Nuclear Materials. 2011 ; Vol. 418, No. 1-3. pp. 22-26.
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