Defect states in substoichiometric tantalum carbide
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
X-ray photoelectron spectroscopy was used to determine core-level binding energies (BE's) and valence-band structure for TaC/sub x-italic/ over the range 0.5approx. 0.6. Also, the relative intensity in the valence-band spectra between about 1 and 2 eV BE increased as x-italic decreased. These observations are explained in terms of (i) an added negative charge in the vicinity of tantalum atoms owing to the presence of carbon vacancies and (ii) the corresponding redistribution of tantalum states, i.e., the formation of occupied defect states. In addition, as x-italic decreased it appears that charge may have transferred away from carbon atoms remaining in the crystal.
- Research Organization:
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5461847
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 34:6; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
Similar Records
Charge-distribution changes accompanying the formation and changes in the composition of HfC sub x and TaC sub x
Charge-Distribution Changes Accompanying the Formation and Changes in the composition of HfCx and TaCx
(1 x 1) rippled relaxation of (100) transition-metal carbide surfaces
Journal Article
·
Wed Aug 15 00:00:00 EDT 1990
· Physical Review, B: Condensed Matter; (USA)
·
OSTI ID:6521698
Charge-Distribution Changes Accompanying the Formation and Changes in the composition of HfCx and TaCx
Journal Article
·
Sat Sep 01 00:00:00 EDT 1990
· Physical Review B
·
OSTI ID:930687
(1 x 1) rippled relaxation of (100) transition-metal carbide surfaces
Journal Article
·
Mon May 01 00:00:00 EDT 1989
· J. Vac. Sci. Technol., A; (United States)
·
OSTI ID:6116228
Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
BINDING ENERGY
CARBIDES
CARBON
CARBON COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY
ENERGY LEVELS
EXPERIMENTAL DATA
FERMI LEVEL
INFORMATION
IONIZING RADIATIONS
NONMETALS
NUMERICAL DATA
PHOTOELECTRON SPECTROSCOPY
POINT DEFECTS
RADIATIONS
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
TANTALUM CARBIDES
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VACANCIES
X RADIATION
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
BINDING ENERGY
CARBIDES
CARBON
CARBON COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY
ENERGY LEVELS
EXPERIMENTAL DATA
FERMI LEVEL
INFORMATION
IONIZING RADIATIONS
NONMETALS
NUMERICAL DATA
PHOTOELECTRON SPECTROSCOPY
POINT DEFECTS
RADIATIONS
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
TANTALUM CARBIDES
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VACANCIES
X RADIATION