Electronic structure of La—Ni intermetallics: a soft X-ray appearance-potential study
| Autor: | D.R. Chopra, T.K. Hatwar |
|---|---|
| Rok vydání: | 1985 |
| Předmět: |
Radiation
Materials science Binding energy Intermetallic Charge (physics) Electronic structure Condensed Matter Physics Atomic and Molecular Physics and Optics Spectral line Electronic Optical and Magnetic Materials Metal Crystallography D band visual_art Atom visual_art.visual_art_medium Physical and Theoretical Chemistry Spectroscopy |
| Zdroj: | Journal of Electron Spectroscopy and Related Phenomena. 35:77-85 |
| ISSN: | 0368-2048 |
| DOI: | 10.1016/0368-2048(85)80043-8 |
| Popis: | Soft X-ray appearance-potential spectra (SXAPS) of La—Ni intermetallic compounds are presented. SXAPS probes the binding energy (BE) of the core levels and provides information about the local density of conduction band states of the constituents as a function of alloy composition. Charge transfer from electropositive La to electronegative Ni is expected in La—Ni intermetallics. Ni metal has only 0.6 d vacancies and Ni spectra should disappear at high La concentrations as a result of charge transfer. Ni peak intensity decreases with increasing La concentration, however, in no case was a complete disappearance of the Ni spectra observed, which is interpreted as evidence for the d character in unoccupied states. The small BE shifts and narrowing of the SXAPS peaks in alloys indicate filling of the 3 d band of Ni due to hybridization of the wave functions centered on different atom sites instead of the charge transfer. |
| Databáze: | OpenAIRE |
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