Oxygen potential of hypo-stoichiometric La-doped UO2

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

doi:10.1016/j.jnucmat.2011.06.045

Oxygen potential of hypo-stoichiometric La-doped UO₂

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

Quantum Sciences of Materials

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

The oxygen potential of hypo-stoichiometric (U_0.8La _0.2)O_2-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 ΔG_O2 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 (U_0.8Gd_0.2)O_2-x. However, the detailed variation of ΔH_O2 and ΔS_O2 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 ΔG_O2 value of lanthanide-doped uranium oxide was discussed in terms of lanthanide ionic radius.

Original language	English
Pages (from-to)	22-26
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	418
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jnucmat.2011.06.045
Publication status	Published - Nov 2011

All Science Journal Classification (ASJC) codes

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

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10.1016/j.jnucmat.2011.06.045

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title = "Oxygen potential of hypo-stoichiometric La-doped UO2",

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.",

author = "Keita Yoshida and Tatsumi Arima and Yaohiro Inagaki and Kazuya Idemitsu and Masahiko Osaka and Shuhei Miwa",

year = "2011",

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doi = "10.1016/j.jnucmat.2011.06.045",

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T1 - Oxygen potential of hypo-stoichiometric La-doped UO2

AU - Yoshida, Keita

AU - Arima, Tatsumi

AU - Inagaki, Yaohiro

AU - Idemitsu, Kazuya

AU - Osaka, Masahiko

AU - Miwa, Shuhei

PY - 2011/11

Y1 - 2011/11

N2 - 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.

AB - 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.

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JO - Journal of Nuclear Materials

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ER -

Oxygen potential of hypo-stoichiometric La-doped UO₂

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