Low-carbon boron carbides produced by CVD (chemical vapor deposition)
Conference
·
OSTI ID:6512056
Boron carbides with low C contents were produced from BCl/sub 3/ and CCl/sub 4/ by chemical vapor deposition at temperatures of 1020 to 1500/sup 0/C. The deposits were found to be between B/sub 13/C/sub 2/ and B/sub 11/C (8.3 to 13.3 at. %C) in composition by means of Auger electron spectroscopy. Raman spectroscopy demonstrates that the specimens contain very little free carbon. Further, disordering of C in the chains and icosahedra of the rhombohedral boron carbide structure for C contents of less than 20 at. % is indicated by the Raman results. Single-phase rhombohedral boron carbides with C contents as low as 12.5 at. % (approx. =B/sub 7/C) have been produced. The most B-rich specimens, containing 8.3 at. % (B/sub 11/C) or less C, were phase separated. At least one of the phases in the phase separated specimens is tetragonal. The electrical conductivity and Hall mobility of the B/sub 11/C specimen are reported.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA); Jet Propulsion Lab., Pasadena, CA (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6512056
- Report Number(s):
- SAND-86-2804C; CONF-870438-19; ON: DE87010684
- Country of Publication:
- United States
- Language:
- English
Similar Records
Boron carbide structure by Raman spectroscopy
Elastic properties of boron carbides
Vapor deposition of binary boron--carbon phases at substrate temperatures of 900 to 1800$sup 0$C. II. Rhombohedral boron carbide
Journal Article
·
Fri Sep 15 00:00:00 EDT 1989
· Physical Review (Section) B: Condensed Matter; (USA)
·
OSTI ID:5575430
Elastic properties of boron carbides
Conference
·
Mon Jul 01 00:00:00 EDT 1991
· AIP Conference Proceedings (American Institute of Physics); (United States)
·
OSTI ID:7116054
Vapor deposition of binary boron--carbon phases at substrate temperatures of 900 to 1800$sup 0$C. II. Rhombohedral boron carbide
Journal Article
·
Fri Mar 01 00:00:00 EDT 1974
· J. Less-Common Metals, v. 35, no. 1, pp. 131-145
·
OSTI ID:4350945
Related Subjects
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
AUGER ELECTRON SPECTROSCOPY
BORON CARBIDES
BORON CHLORIDES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CARBON TETRACHLORIDE
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
CHLORIDES
CHLORINATED ALIPHATIC HYDROCARBONS
CHLORINE COMPOUNDS
COHERENT SCATTERING
DEPOSITION
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
HALIDES
HALL EFFECT
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
LASER SPECTROSCOPY
MICROSCOPY
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHYSICAL PROPERTIES
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SCANNING ELECTRON MICROSCOPY
SCATTERING
SPECTRA
SPECTROSCOPY
SURFACE COATING
X-RAY DIFFRACTION
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
AUGER ELECTRON SPECTROSCOPY
BORON CARBIDES
BORON CHLORIDES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CARBON TETRACHLORIDE
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
CHLORIDES
CHLORINATED ALIPHATIC HYDROCARBONS
CHLORINE COMPOUNDS
COHERENT SCATTERING
DEPOSITION
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
HALIDES
HALL EFFECT
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
LASER SPECTROSCOPY
MICROSCOPY
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHYSICAL PROPERTIES
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SCANNING ELECTRON MICROSCOPY
SCATTERING
SPECTRA
SPECTROSCOPY
SURFACE COATING
X-RAY DIFFRACTION