Synchrotron radiation studies of the formation of niobium carbide layers on niobium
The formation of a NbC overlayer on Nb has been observed with the use of valence-band photoemission, near-edge absorption at the C K edge, and photon- and electron-stimulated Auger decay. The sample was produced by depositing an amorphous C layer on a Nb substrate either by dc glow discharge in a hydrocarbon ambient or by sputtering from a graphite target. Annealing this film first produced a previously reported graphitic phase and finally the carbide. Features in the spectra agreed well with bulk NbC density-of-states features. The results are also related to those obtained in electron-stimulated Auger measurements of carbidic and graphitic layers on catalytic surfaces, and show some agreement with calculations by Feibelman for such surface layers. Comparison of the photoemission measurements with Auger results for variously prepared samples showed a greater sensitivity of the former to details of the electronic structure.
- Research Organization:
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973
- OSTI ID:
- 6231383
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 30:2; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION SPECTROSCOPY
AMORPHOUS STATE
AUGER EFFECT
BREMSSTRAHLUNG
CARBIDES
CARBON
CARBON COMPOUNDS
DATA
ELECTRIC DISCHARGES
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY-LEVEL DENSITY
EXPERIMENTAL DATA
GLOW DISCHARGES
INFORMATION
LAYERS
METALS
NIOBIUM
NIOBIUM CARBIDES
NIOBIUM COMPOUNDS
NONMETALS
NUMERICAL DATA
PHOTOELECTRON SPECTROSCOPY
RADIATIONS
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
SPUTTERING
SYNCHROTRON RADIATION
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
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