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.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Materials Science(all)
- Nuclear Energy and Engineering