Formation of niobium carbide by the carbonization of Nb/sub 2/O/sub 5/ in an argon plasma arc (superconducting properties)
Journal Article
·
· High Temp. Sci.; (United States)
OSTI ID:7095001
The formation of niobium carbide by the carbonization of Nb/sub 2/O/sub 5/ with graphite in an argon plasma arc has been studied. A metallic cake was formed on the anode. X-ray diffraction patterns and chemical analysis showed that the cake was nearly stoichiometric NbC. The overall reaction appears to be Nb/sub 2/O/sub 5/ + 7C = 2NbC + 5CO. The molar ratio of graphite to Nb/sub 2/O/sub 5/, current, and reaction time considerably affected the reaction. The measured value of the density was 7.81 g/cm/sup 3/ for the stoichiometric NbC, in agreement with the x-ray density. The products were found to be superconducting and the transition temperature varied with composition. The highest transition temperature was reached for the stoichiometric NbC and was 11.3K. 13 references.
- Research Organization:
- Aoyama Gakuin Univ., Tokyo
- OSTI ID:
- 7095001
- Journal Information:
- High Temp. Sci.; (United States), Journal Name: High Temp. Sci.; (United States) Vol. 6:2; ISSN HITSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL PREPARATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
NIOBIUM CARBIDES
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
360104* -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL PREPARATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
NIOBIUM CARBIDES
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE