Effect of grain-boundaries on uranium and oxygen diffusion in polycrystalline UO2.

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2000
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The influence of grain-boundaries on uranium and oxygen difusion in polycrystalline UO2 has been investigated. Our results show that between 1498°C and 1697°C, in H2 atmosphere, uranium difusion in UO2 grain-boundaries is about ®ve orders of magnitude greater than uranium volume di€usion, in the same experimental conditions. Between 605°C and 750°C, in H2/N2/H2O atmosphere, the oxygen difusion coe cients measured in polycrystalline and single crystalline UO2 are similar, and correspond to the volume difusion.
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SABIONI, A. C. S.; FERRAZ, W. B.; MILLOT, F. Effect of grain-boundaries on uranium and oxygen diffusion in polycrystalline UO2. Journal of Nuclear Materials, v. 278, n. 2-3, p. 364-369, abr. 2000. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0022311599002500>. Acesso em: 16 jul. 2012.