Oxygen potentials of (U0.685Pu0.270Am0.045)O2−x solid solution

Chemical thermodynamic analysis of americium-containing UO2 and (U,Pu)O2

“…There are some data for the oxygen potentials of Amcontaining oxides; i.e., AmO 2−x [4], (U 0.5 Am 0.5 )O 2±x [5], and (U 0.685 Pu 0.270 Am 0.045 )O 2−x [6]. However, such data are limited, and insufficient to predict various properties and irradiation behavior of Am-containing oxides.…”

“…A discontinuity of the oxygen potential isotherms can be seen for (U 0.680 Pu 0.290 Am 0.030 )O 2−x , as well as (U 0.685 Pu 0.270 Am 0.045 )O 2−x . This is the effect of Am addition; possibly an ordering of the defect structure in the oxide [6].…”

Chemical thermodynamic representation of (U,Pu,Am)O2−x

“…The oxygen potentials of (U, Pu, Am)O 2Àx have, thus, been measured as a function of oxygen to metal (O/M) ratio in the temperature range between 1123 K and 1423 K, and it was found that the oxygen potentials were much higher in (U, Pu, Am)O 2Àx than in the MOX fuel with the same content of Pu [4]. It is important to estimate the oxygen potential reliably at high temperature from data obtained in a limited temperature range, since the fuel experiences high temperature during irradiation.…”

Innovative oxide fuels doped with minor actinides for use in fast reactors

“…On the other hand, it was revealed that thermodynamic properties were significantly influenced by the addition of Am. Osaka et al [13] found that oxygen potential, which is one of the most important properties that affect almost all bulk properties of oxide fuels, was notably higher than that of the MOX fuel. As oxygen potential dominates the phase behaviour of burnup fuels, thermal properties of a burnup fuel can significantly differ from those of the MOX, if Am content is raised.…”