Oxygen potential of hypo-stoichiometric Lu-doped UO2 |
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| Authors: | Masahiko Osaka Kosuke Tanaka |
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| Affiliation: | Japan Atomic Energy Agency, 4002 Narita-cho, Oarai-machi, Higashiibaraki-gun, Ibaraki 311-1393, Japan |
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| Abstract: | Oxygen potentials of hypo-stoichiometric Lu-doped UO2, (U0.80Lu0.20)O2−x, were experimentally investigated by thermogravimetric analysis using H2O/H2 gas equilibria at 1173, 1273 and 1473 K. The oxygen potentials of (U,Lu)O2−x were higher than those of other forms of rare earth-doped UO2, specifically (U,Nd)O2−x, (U,Gd)O2−x, and (U,Er)O2−x. Slope analyses for plots of oxygen potential versus deviation from stoichiometry indicated that (U0.80Lu0.20)O2−x had a similar defect structure to that of the other forms of rare earth-doped UO2. A relationship between the effective ionic radii and oxygen potentials was found for the hypo-stoichiometric rare earth-doped UO2. |
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| Keywords: | 28.41.Bm |
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