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

F. Qin; J. W. Anderegg; C. J. Jenks; B. Gleeson; D. J. Sordelet; P. A. Thiel

doi:10.1016/j.susc.2007.10.007

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

F. Qin, J. W. Anderegg, C. J. Jenks, B. Gleeson, D. J. Sordelet, P. A. Thiel

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

We have studied the early-stage of oxide formation on (1 1 1)-oriented (Pt, Ni)₃Al single crystals in air. From X-ray photoelectron spectroscopy (XPS), the predominant surface oxide changed from NiO to Al₂O₃, as oxidation temperature increased from 900 to 1300 K. Some NiAl₂O₄ (spinel) also formed at the higher temperatures. Under conditions where NiO and/or NiAl₂O₄ 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 Al₂O₃ in the underlying oxide region, (3) reduce the total oxide layer thickness, and (4) sharpen the interface between the oxide and the metallic alloy.

Original language	English
Pages (from-to)	205-215
Number of pages	11
Journal	Surface Science
Volume	602
Issue number	1
DOIs	https://doi.org/10.1016/j.susc.2007.10.007
State	Published - Jan 1 2008
Externally published	Yes

Funding

This work was supported by the Director, Ames Laboratory, U.S. Department of Energy, Contract No. DE-AC02-07CH11358.

Funders	Funder number
Ames Laboratory
U.S. Department of Energy	DE-AC02-07CH11358

Keywords

Alloys
Aluminum oxide
Nickel aluminide
Nickel oxides
Oxidation
Platinum
X-ray photoelectron spectroscopy

Access to Document

10.1016/j.susc.2007.10.007

Cite this

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

abstract = "We have studied the early-stage of oxide formation on (1 1 1)-oriented (Pt, Ni)3Al single crystals in air. From X-ray photoelectron spectroscopy (XPS), the predominant surface oxide changed from NiO to Al2O3, as oxidation temperature increased from 900 to 1300 K. Some NiAl2O4 (spinel) also formed at the higher temperatures. Under conditions where NiO and/or NiAl2O4 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 Al2O3 in the underlying oxide region, (3) reduce the total oxide layer thickness, and (4) sharpen the interface between the oxide and the metallic alloy.",

keywords = "Alloys, Aluminum oxide, Nickel aluminide, Nickel oxides, Oxidation, Platinum, X-ray photoelectron spectroscopy",

author = "F. Qin and Anderegg, {J. W.} and Jenks, {C. J.} and B. Gleeson and Sordelet, {D. J.} and Thiel, {P. A.}",

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AU - Anderegg, J. W.

AU - Jenks, C. J.

AU - Gleeson, B.

AU - Sordelet, D. J.

AU - Thiel, P. A.

PY - 2008/1/1

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N2 - We have studied the early-stage of oxide formation on (1 1 1)-oriented (Pt, Ni)3Al single crystals in air. From X-ray photoelectron spectroscopy (XPS), the predominant surface oxide changed from NiO to Al2O3, as oxidation temperature increased from 900 to 1300 K. Some NiAl2O4 (spinel) also formed at the higher temperatures. Under conditions where NiO and/or NiAl2O4 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 Al2O3 in the underlying oxide region, (3) reduce the total oxide layer thickness, and (4) sharpen the interface between the oxide and the metallic alloy.

AB - We have studied the early-stage of oxide formation on (1 1 1)-oriented (Pt, Ni)3Al single crystals in air. From X-ray photoelectron spectroscopy (XPS), the predominant surface oxide changed from NiO to Al2O3, as oxidation temperature increased from 900 to 1300 K. Some NiAl2O4 (spinel) also formed at the higher temperatures. Under conditions where NiO and/or NiAl2O4 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 Al2O3 in the underlying oxide region, (3) reduce the total oxide layer thickness, and (4) sharpen the interface between the oxide and the metallic alloy.

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KW - Oxidation

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