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Braginski, A.I.; Roland, G.W.; Daniel, M.R.; Woolam, J.A.
Westinghouse Electric Corp., Pittsburgh, PA (USA). Research and Development Center1977
Westinghouse Electric Corp., Pittsburgh, PA (USA). Research and Development Center1977
AbstractAbstract
[en] A process of fabricating superconducting Nb3Ge tapes by chemical vapor deposition (CVD) has been developed, and tapes up to 10 meters lone have been fabricated. The typical properties achieved were as follows: critical temperature T sub c = 20 K, upper critical field H sub c2 = 29 tesla at 4.2 K, and J sub c = 3 to 4 x 10 Am-2 at 4.2 K, 18 tesla. The relative depression of T sub c and H sub c2 compared with the best thin-film samples sputtered on sapphire was due to the presence of Nb5Ge3 second-phase particles used as flux pinning centers and to strains induced by thermal mixmatch with Hastelloy B tape substrates. A peculiar field dependence of flux pinning force that was observed in both CVD and sputtered Nb3Ge indicated a premature pin-breaking mechanism or a phase inhomogeneity. Directions of further optimization work were defined
Original Title
Nb3 Ge
Primary Subject
Secondary Subject
Source
Nov 1977; 116 p; NASA-CR--135364; Available from NTIS. PC A06/MF A01
Record Type
Report
Report Number
Country of publication
ALLOY SYSTEMS, ALLOYS, CHEMICAL COATING, CURRENTS, DEPOSITION, ELECTRIC CONDUCTIVITY, ELECTRIC CURRENTS, ELECTRICAL EQUIPMENT, ELECTRICAL PROPERTIES, ELECTROMAGNETS, MAGNETIC FIELDS, MAGNETS, NIOBIUM ALLOYS, PHYSICAL PROPERTIES, SUPERCONDUCTING DEVICES, SURFACE COATING, THERMODYNAMIC PROPERTIES, TRANSITION ELEMENT ALLOYS
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