Changes in the electronic structure of platinum−3d
transition single-crystal alloys
(Pt1
-
x
M
x
with M = Fe,
Co, and Ni) are studied as a function of composition, order and nature
of the 3d metal. These changes are
detected by using synchrotron radiation to analyze the absorption
edges. Both the Pt LII and LIII edges
and
the 3d metal K edge exhibit correlated changes, which are most
sensitive to the minority element in the alloy.
The modifications on the Pt LII and LIII
edges are interpreted as resulting from a variation of the number
of
holes in the 5d band, corresponding to an electron transfer to platinum
from the 3d metal. The corresponding
changes observed on the 3d metal K edge point to a population
rearrangement between the probed levels
originating from the atomic 3d, 4s, and 4p levels. An effect of
ordering has also been observed in the Pt−Co
alloys the magnitude of which is greater at the Co K-edge for the
lowest concentration of this element.
Finally, we compare our results to available calculations and
experimental results obtained by other techniques.
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