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XPS core‐level shifts and XANES studies of Cu–Pt and Co–Pt alloys
Author(s) -
Lee YounSeoung,
Lim KwanYong,
Chung YongDuck,
Whang ChungNam,
Jeon Yongseog
Publication year - 2000
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/1096-9918(200008)30:1<475::aid-sia817>3.0.co;2-w
Subject(s) - xanes , binding energy , valence (chemistry) , x ray photoelectron spectroscopy , chemistry , core electron , spectral line , electronic structure , density of states , analytical chemistry (journal) , electron , crystallography , atomic physics , materials science , condensed matter physics , computational chemistry , nuclear magnetic resonance , physics , organic chemistry , astronomy , quantum mechanics , chromatography
The K and L 2,3 absorption edges and core‐level binding‐energy shifts for pure Co, Cu and Pt and Co–Pt and Cu–Pt alloys are measured to investigate changes in electronic structures of these alloys. Enhancements and depletion of the white lines in the alloys as compared to pure elements were correlated with changes in the unoccupied density of states upon alloying. We find that the Pt atoms lost d 3/2 electrons and gained d 5/2 electrons when alloyed with Cu and Co. However, the total 5d occupancy changes of the Pt were very little in Cu–Pt alloys, and this is consistent with the small shifts of Pt 4f core‐level binding energy. From the quantitative analysis of Cu and Co K‐edge absorption spectra, it is found that Cu and Co have significant valence occupation changes due to dehybridization of p–d states. From these results, we suggest that the core‐level shifts are affected mainly by the d‐valence electron changes in these alloys. Copyright © 2000 John Wiley & Sons, Ltd.