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Oxidation of Al–Au intermetallics and its consequences studied by x-ray photoelectron spectroscopy

Published online by Cambridge University Press:  31 January 2011

T. Sritharan ,
Y.B. Li ,
C. Xu  and
S. Zhang
T. Sritharan*
Affiliation:
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
Y.B. Li
Affiliation:
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore; and Center for Composite Materials, School of Astronautics, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
C. Xu
Affiliation:
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
S. Zhang
Affiliation:
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Three common Al–Au intermetallics, Al2Au, AlAu2, and AlAu4, were oxidized in the air and characterized using x-ray photoelectron spectroscopy in terms of the elemental chemical state. It was found that there is an increasing trend of oxidation in these intermetallics as the Au content increases. AlAu4 shows the greatest tendency to oxidize with two extra peaks appearing on the Au 4f spectra after long exposure time in air. The surface of AlAu2, although fully oxidized, reveals only one Au 4f peak shift as depth increases. Al2Au was the least oxidizing compound, and the oxide is thin. The binding energies of Al 2p and Au 4f peaks were measured and reported. The Au atoms trapped in the oxide layers exhibit higher binding energy emissions compared to those of elemental Au.

Keywords

AlAuX-ray photoelectron spectroscopy (XPS)
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 5 , May 2008 , pp. 1371 - 1382
Copyright
Copyright © Materials Research Society 2008

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