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Ultraviolet photoemission spectroscopy was used to study the reactivity of UNiAl with O(2), CO(2) and CO at 77, 296 and 423 K. For O(2) adsorption at 77 K, the dissociation of O(2) is observed at low dosages followed by oxygen chemisorption at the surface. After this the formation of uranium and aluminum oxides is detected. At 77 K, UO(2+x) is formed, whereas at 296 and 423 K only substoichiometric oxides of uranium, UO(2-x) are seen. Dissociation of CO(2) at 77 K is observed for low dosages, resulting in a saturation of the surface; afterwards physisorption of CO(2) takes place. At 296 and 423 K, only CO(2) dissociation is observed. It is suggested that under these conditions uranium oxycarbide is formed. At 77 K, low dosage CO adsorption results in chemisorption of CO and, after saturation of the surface, CO is physisorbed. At 296 and 423 K, only CO dissociation is observed. Again the formation of uranium oxycarbide is suggested.

Additional information

Authors: ALMEIDA T, JRC Karlsruhe (DE);SPIRLET J C, JRC Karlsruhe (DE);NAEGELE J R, JRC Karlsruhe (DE);HAVELA L, Charles University, Department of Metal Physics, Prague (CS)
Bibliographic Reference: Paper presented: 12th European Conference on Surface Science, Stockholm (SE), Sept. 9-13, 1991
Availability: Available from (1) as Paper EN 36556 ORA
Record Number: 199210187 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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