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Abstract

The reactivity of polycrystalline UFe(2) with O(2), CO and CO(2) has been studied by X-ray photoelectron spectroscopy. The same surface chemistry is observed for sputtered-clean and abraded-clean UFe(2) surfaces, although ion bombardment results in some iron depletion compared to in situ abrasion. Adsorption of O(2) on UFe(2) surfaces leads to preferential oxidation of U to UO(2) and segregation of U to the surface. Further O(2) exposure results in Fe oxidation and the Fe 2p spectrum (Fe 2p(3/2)=710.4-710.8 eV) indicates a mixture of, or an intermediate state between, Fe(2+) and Fe(3+). CO and CO(2) dissociatively chemisorb on UFe(2) surfaces leading to some uranium oxidation and to carbon atoms located deeper into the sample than the oxygen atoms.

Additional information

Authors: SCHULTZ J C, University of California, Lawrence Livermore Lab. Livermore (US);NAEGELE J, JRC Karlsruhe Estab. (DE);SPIRLET J C, JRC Karlsruhe Estab. (DE)
Bibliographic Reference: Article: Surface Science, Vol. 198 (1988), pp. 301-314
Record Number: 198910817 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en