Ce-catalyzed oxidation of Ta(110)

Journal Article · Sun Jul 15 04:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.1526· OSTI ID:6716870

Gu, C; Lynch, D W; Yang, A B; Olson, C G ^[1]

---

1. Department of Physics, Ames, IA (USA) Ames Laboratory, Iowa State University, Ames, IA (USA)

Photoemission spectroscopy was used to investigate the initial oxidation of the Ce/Ta(110) interface at room temperature. The oxidation of Ta(110) is dramatically enhanced by a thin Ce overlayer. A Ta suboxide TaO{sub {chi}} (0.5{le}{chi}{le}1) is formed first in the interface, followed by the rapid formation of Ta{sub 2}O{sub 5} upon further oxygen exposure. A weak interface reaction exists in Ce/Ta(110), but is excluded as the main cause of the catalytic oxidation. An earlier suggestion is reconfirmed that the Ce layer converts O{sub 2} to oxygen ions and thus promotes the oxidation of the substrate.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6716870
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:3; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
BREMSSTRAHLUNG
CATALYTIC EFFECTS
CERIUM
CHEMICAL REACTIONS
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
INTERFACES
MEDIUM TEMPERATURE
METALS
OXIDATION
PHOTOELECTRON SPECTROSCOPY
RADIATIONS
RARE EARTHS
SPECTROSCOPY
SYNCHROTRON RADIATION
TANTALUM
TRANSITION ELEMENTS