Superconducting properties of thin film niobium carbonitrides on carbon fibers

Conference · Sat Mar 01 04:00:00 EDT 1975 · IEEE Trans. Magn., v. MAG-11, no. 2, pp. 185-188

OSTI ID:4118036

Pike, G E; Mullendore, A W; Schirber, J E; Napier, J

The characteristics of a new superconducting wire material, consisting of a 7 $mu$m carbon filament substrate thinly coated with niobium carbonitride, are reported. These filaments are coated (approximately 1000 at a time as a yarn) by a co-CVD process in which the desired carbonitride is deposited as a compound. Several coating compositions from NbC to NbC.$sub 75$N.$sub 15$ were studied. At each composition several coating thicknesses from 300 to 3000 A were prepared. Although the present coating compositions are not near NbC$sub 0$$.$$sub 3$$N$$sub 0$$.$$sub 7$, which has previously been determined as optimum for this pseudobinary system, we nevertheless have obtained excellent superconducting properties. Zero-field critical current densities of 2 x 10$sup 6$ A/cm$sup 2$ in the coating have been obtained, and there is no discernable ac loss at frequencies up to 50 kHz. In addition to the superconducting measurements, chemical x-ray diffraction, and electron microscopic analyses on the coated filaments were also performed. (auth)

• Research Organization: Sandia Labs., Albuquerque, NM
• NSA Number: NSA-33-017659
• OSTI ID: 4118036
• Conference Information: Journal Name: IEEE Trans. Magn., v. MAG-11, no. 2, pp. 185-188
• Country of Publication: United States
• Language: English

Related Subjects

*NIOBIUM CARBIDES-- SUPERCONDUCTIVITY
*NIOBIUM NITRIDES-- SUPERCONDUCTIVITY
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Cermets & Refractories-- Physical Properties
CARBON
CARBONITRIDES
CRITICAL CURRENT
FIBERS
FILAMENTS
FILMS
MICROSTRUCTURE
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
N66200 --Physics (Low Temperature)--Superconductivity