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- W2000617415 abstract "Surface diffusion on UO2 was measured by the spreading of U-234 tracer on the surface of a duplex diffusion couple consisting of wafers of depleted and enriched UO2 joined by a bond of uranium metal. Spurious gas phase transport was eliminated by a masking technique. Surface diffusion coefficients measured at temperature between 1760 and 2110°C ranged from 0.1 to 2 cm2/s. These results correspond to Arrhenius-type behavior with an activation energy of 72 ± 15 kcal/mol and a preexponential factor 5 × 106cm2/s with a 1–2 order of magnitude uncertainty range. The preexponential factor was in reasonable accord with the nonlocalized surface diffusion model of Bonzel, although the jump distance implicit in this theory appears to be unacceptably large. No significant effect of the atomic weight of the inert species in the gaseous environment at 1 atm pressure was detected, a result which is not inconsistent with the theory." @default.
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- W2000617415 date "1984-01-01" @default.
- W2000617415 modified "2023-09-26" @default.
- W2000617415 title "Tracer surface diffusion on uranium dioxide" @default.
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- W2000617415 doi "https://doi.org/10.1016/0039-6028(84)90656-3" @default.
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