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- W2090468364 abstract "The initial sintering kinetics of UO2 and UO2-Gd2O3 (5 and 10 wt%) compacts have been studied at controlled oxygen potentials in the temperature range of 925–1100 ° C, by using a dilatometer. Most of the initial shrinkage of both the compacts appeared to be caused by neck growth between two adjacent UO2 particles, and could be interpreted as controlled by the grain boundary diffusion of cations. The diffusion coefficients calculated from the isothermal sintering rates were significantly decreased with decreasing oxygen potential and with increasing Gd2O3 concentration. The activation energy for the diffusion obtained in a reducing atmosphere of PH2O/PH2 = 10−3 was 377 kJ/mol for UO2 and 418 kJ/mol for the UO2-10 wt% Gd2O3 compact. The dependence of the grain boundary diffusion coefficient, DB, on x in UO2+x at 1000°C could be described by log DB(cm2/s) = − 8.57 + 1.67 log x, from the known relation between x and the oxygen potential of UO2+x. These phenomena were attributed to nonstoichiometric effects on the diffusions for UO2 and (U, Gd)O2 solid solutions." @default.
- W2090468364 created "2016-06-24" @default.
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- W2090468364 date "1988-08-01" @default.
- W2090468364 modified "2023-09-26" @default.
- W2090468364 title "Effect of oxygen potential on the initial sintering of UO2 and UO2-Gd2O3 compacts" @default.
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- W2090468364 doi "https://doi.org/10.1016/0022-3115(88)90170-5" @default.
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