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Electron Spectroscopic Studies of Substoichiometric Tantalum Carbide

Published online by Cambridge University Press:  22 February 2011

G. R. Gruzalski ,
D. M. Zehner  and
G. W. Ownby
G. R. Gruzalski
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
D. M. Zehner
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
G. W. Ownby
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
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Abstract

XPS was used to determine core-level binding energies and valence-band structure for TaCx over the range 0.5 ≲ × ≲ 1.0. As x decreased, the carbonls binding energy (BE) changed very little, the carbon-2s BE shifted toward the Fermi level, the position of the p-d valence-band peak shifted toward the Fermi level more, and the tantalum-4d and -4f BE's shifted toward the Fermi level even more, about 0.16 eV for a change in × of 0.1. In addition, the valence-band spectra exhibited structure between about 1 and 2 eV BE, and this structure increased as x decreased. These observations are explicable in terms of charge transfer and the formation of occupied defect states associated with carbon vacancies.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 48: Symposium E – Applied Materials Characterization , 1985 , 19
Copyright
Copyright © Materials Research Society 1985

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References

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