X-ray photoelectron spectroscopy studies of the early-stage oxidation behavior of (Pt, Ni)3Al(1 1 1) surfaces in air

Journal Article · Tue Oct 09 04:00:00 EDT 2007 · Surface Science

OSTI ID:973166

Qin, F; Anderegg, J; Jenks, C; Gleeson, B; Sordelet, D; Thiel, P

We have studied the early-stage of oxide formation on (1 1 1)-oriented (Pt, Ni){sub 3}Al single crystals in air. From X-ray photoelectron spectroscopy (XPS), the predominant surface oxide changed from NiO to Al{sub 2}O{sub 3}, as oxidation temperature increased from 900 to 1300 K. Some NiAl{sub 2}O{sub 4} (spinel) also formed at the higher temperatures. Under conditions where NiO and/or NiAl{sub 2}O{sub 4} were present, it resided atop a layer of aluminum oxide, mixed in some cases with metallic Ni. By comparing samples that contained 0, 10 and 20 at% Pt in the bulk, we found that the effects of Pt were to (1) promote the preferential formation of aluminum oxide over nickel oxide(s) in the top layer at all temperatures studied, (2) suppress the amount of metallic Ni mixed with Al{sub 2}O{sub 3} in the underlying oxide region, (3) reduce the total oxide layer thickness, and (4) sharpen the interface between the oxide and the metallic alloy.

• Research Organization: Ames Laboratory (AMES), Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-07CH11358
• OSTI ID: 973166
• Report Number(s): IS-7379
• Journal Information: Surface Science, Journal Name: Surface Science Journal Issue: 1 Vol. 602; ISSN 0039-6028
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
AIR
ALLOYS
ALUMINIUM
ALUMINIUM OXIDES
MONOCRYSTALS
NICKEL
NICKEL OXIDES
OXIDATION
OXIDES
PLATINUM
THICKNESS
X-RAY PHOTOELECTRON SPECTROSCOPY