Clean Surface and Oxidation Behavior of Vanadium Carbide, VC0.75(100)

✍ Scribed by Antonik, M. D.; Lad, R. J.; Christensen, T. M.

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 861 KB
• Volume: 24
• Category: Article
• ISSN: 0142-2421
• DOI: 10.1002/(sici)1096-9918(19960930)24:10<681::aid-sia179>3.0.co;2-t

✦ Synopsis

The clean singlecrystal VCo~,,(lOO) surface, its oxidation, and the stability of the resulting oxide were examined with electron spectroscopy (AES, XPS and U P S ) , electron diffraction (low-energy and reflection high-energy electron diffraction) and atomic force microscopy (AFM). The clean VC0.75 surface exhibits carbon vacancy-related features in valence band spectroscopy data. This surface was exposed to 0, at 500 "C for up to 10 000 Langmuirs. The oxidation leads to the formation of vanadium oxide, VO,.(l00), crystallites on the VC,.,,(lOO) substrate. The AFM images indicate that oxide crystallites grow with an elongated shape along {Ool) type directions. When heated above lo00 "C, the oxide is unstable and a clean VC,.,,(lOo) surface is produced.