Atomic H(D) adsorption on polycrystalline UO[sub 2] and UO[sub 2](111) surfaces

Voss, M. R.; Paffett, M. T.
July 2000
AIP Conference Proceedings;2000, Vol. 532 Issue 1, p346
Academic Journal
The chemical reactions of U-containing surfaces with water, oxygen, and hydrogen are important to the corrosion of nuclear materials and to gas generation reactions that have been identified in the long-term storage of these materials. In addition, the role of H atoms arising from radiolysis of adsorbed water may play a crucial role in hydrogen gas generation in actinide oxide storage environments. In this fundamental study, we examine the role of surface structure and order in the chemical reactivity of H atoms and adsorbed water with model UO[sub 2] surfaces. The chemical behavior of highly defected and/or polycrystalline UO[sub 2] surfaces is directly compared with that seen from a highly ordered UO[sub 2](111) surface thus providing insight into molecular-scale processes important to understanding site reactivity. © 2000 American Institute of Physics.


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