Critical current densities of the multifilamentary Nb/sub 3/Sn superconductors produced by the solid-liquid diffusion method

Journal Article · Mon Nov 01 04:00:00 EST 1982 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.330120· OSTI ID:6752798

Yamasaki, H; Umeda, M; Watanabe, M; Kimura, Y

The critical current and critical temperature of the multifilamentary Nb/sub 3/Sn superconductors produced by the solid-liquid diffusion method were measured for various heat treatments, and were discussed in relation to the process of Nb/sub 3/Sn formation. The critical current density Jc for the fine-grained Nb/sub 3/Sn layer, which was formed at the interface of the intermediately formed Nb/sub 6/Sn/sub 5/ layer and the Nb matrix, was calculated to be 5--6 x 10/sup 5/ A/cm/sup 2/ at 9.5 T and 4.2 K, which is a little higher than the best Jc value for the Nb/sub 3/Sn layers of the bronze-processed conductors. The Jc value increased during the formation of the fine-grained Nb/sub 3/Sn layers and reached its maximum value when the reaction process was nearly completed and thick Nb/sub 3/Sn layers were formed, though Jc decreases during the growth of Nb/sub 3/Sn layers in the bronze process. By this solid-liquid diffusion method, thick (approx.5--20 ..mu..m) and high Jc Nb/sub 3/Sn layers are obtained, so that the overall Jc of the conductor (without a Cu stabilizer area) exceeds 1.5 x 10/sup 5/ A/cm/sup 2/ at 9.5 T, and is twice as high as that of the bronze-processed conductors.

• Research Organization: Electrotechnical Laboratory, MITI, 1-4 Umezono 1-chome, Sakuramura Niiharigun, Ibaraki, 305 Japan
• OSTI ID: 6752798
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 53:11; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENT DENSITY
CURRENTS
DATA
DIFFUSION
ELECTRIC CURRENTS
EXPERIMENTAL DATA
FILAMENTS
FLUIDS
GRAIN SIZE
HEAT TREATMENTS
INFORMATION
INTERFACES
LAYERS
LIQUIDS
MICROSTRUCTURE
NIOBIUM ALLOYS
NUMERICAL DATA
PHYSICAL PROPERTIES
SIZE
SOLIDS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TIN ALLOYS
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE