Preparation of Sm-Ru bimetallic alloy films on Ru(0001) surface by vapour-deposition and annealing |
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Authors: | G Ranga Rao H Nozoye |
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Affiliation: | (1) Department of Chemistry, Indian Institute of Technology, 600 036 Chennai, India;(2) National Institute of Materials and Chemical Research, 1-1 Higashi, 305 Tsukuba, Ibaraki, Japan |
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Abstract: | Sm-Ru intermetallic surface alloy films were prepared by vacuum deposition and annealing of rare earth Sm on single crystal
Ru(0001) surface. The Ru 3
d
and Sm 3
d
core level spectra clearly show the formation of surface alloy layers. XPS measurements on surface alloy film revealed an
induced peak in the Ru 3
d
region at lower binding energy by 1 eV compared to the bulk Ru (elemental) suggesting an electronic effect of alloying and
Sm-Ru bond formation. The Sm 3
d
5/2
photoemission peak of Sm film consists of strong features characteristic of Sm(II) with electron configuration 4
f
6
(5
d
6
s
)
2
and Sm(III) with electron configuration 4
f
5
(5
d
6
s
)
3
.It is observed that the Sm(II) feature decreases in intensity upon alloy formation with surface Ru atoms. Oxidation of these
films with carbon monoxide indicates alloy breakdown due to the oxidation of Sm atoms selectively. Alloy oxidation also shows
a clear shift of Sm 3
d
5/2
feature. |
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Keywords: | Surface film XPS rare earth bimetallic alloy ruthenium |
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