Interdiffusion des cations dans les oxydes mixtes et ; influence de la teneur en uranium, de la temperature et de l'ecart a la stoechiometrie

Applicability of CeO2 as a surrogate for PuO2 in a MOX fuel development

“…This result can be explained by the diffusivity of Pu and Ce in UO 2 structure. The data reported in the literature [17][18][19][20] shows a big discrepancy among them by the influence of experimental factors. But it is generally accepted that both (U, Pu)O 2 and (U, Ce)O 2 have a similar behaviour in diffusion-controlled thermal processes [6,19].…”

Effect of residual carbon on the sintering behavior of MOX pellets

“…The residual carbon in the MOX pellets after de-waxing was completely removed during heating ( 15 60 45 105 75 120 90 135 157.5 30 0 1 0 45 105 75 120 90 135 157. 30 0 1 5 6 0 45 105 75 120 90 135 157.5 30 0 1 0 45 105 75 120 90 135 157.…”

“…Baptiste and Gallet [15] have investigated the O/ M dependence of metal ion inter-diffusion coefficient (described as the inter-diffusion coefficient hereafter) in MOX fuel and showed that the inter-diffusion coefficient was the smallest near O/M = 1.99, but sharply increased with the deviation of O/M ratio from this value at 1873 and 2178 K. Assuming that this relationship between the O/M ratio and interdiffusion coefficient holds at other temperatures, it is easy to understand why the specimen with higher residual carbon content showed a larger shrinkage rate from 1273 to 1523 K as follows.…”

“…(8). Although the decrease of O/M ratio can not be exactly evaluated during heating, the diffusion coefficient increases by one to three orders of magnitude with the decrease of O/M ratio according to Baptiste and Gallet [15]. It is, then, assumed that the inter-diffusion coefficient in the specimens with high residual carbon content is two orders of magnitude larger than the one with the low residual carbon content.…”

Cation interdiffusion in uranium–plutonium mixed oxide fuels: Where are we now?

“…Frontiers in Nuclear Engineering frontiersin.org Theisen and Vollath, 19671967;Riemer and Scherff, 1971;Schmitz, Marajofsky;Chilton and Edwards, 1978;Lambert, 1978;Glasser-Leme and Matzke, 1982;Matzke, 1983b;Glasser-Leme and Matzke, 1984;Verma, 1984;Glasser-Leme, 1985;Jean-Baptiste and Gallet, 1985;Marin, 1988;Mendez;Kutty et al, 1999;Sato et al, 2010;Noyau, 2012;Berzati, 2013). Most of the available data are from the 1970s-1980s, and recent studies are scarce.…”