Vanadium-gallium
Vanadium-gallium (V3Ga) a superconducting alloy of vanadium and gallium often used for the high field insert coils of superconducting electromagnets.
Vanadium-gallium tape is used in superconducting magnets (17.5 teslas or 175,000 gauss). The structure of the superconducting A15 phase of V3Ga is similar to that of the more common Nb3Sn and Nb3Ti.[1]
The high field characteristics can be improved by doping with high-Z elements such as Nb, Ta, Sn, Pt and Pb[2]
Superconducting properties
- Critical temperature (Tc) : ~14.2 Kelvin[3]
- Upper critical field (Hc2) : Over 19 Tesla.
Fabrication of superconductive wires or tapes
V3Ga wires can be formed using solid-state precipitation[4]
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V3Ga superconducting tape (10×0.14 mm cross section). A vanadium core is covered with 15 µm V3Ga layer, then 20 µm bronze (stabilizing layer) and 15 µm insulating layer. Critical current 180 A (19.2 tesla, 4.2 K), critical current density 20 kA/cm2
References
- ↑ Markiewicz, W.; Mains, E.; Vankeuren, R.; Wilcox, R.; Rosner, C.; Inoue, H.; Hayashi, C.; Tachikawa, K. (1977). "A 17.5 Tesla superconducting concentric Nb3Sn and V3Ga magnet system". IEEE Transactions on Magnetics. 13 (1): 35–37. doi:10.1109/TMAG.1977.1059431.
- ↑ Tedrow, P. M.; Meservy, R. (1984), Improvement in magnetic field properties of vanadium-gallium superconductors by enhancement of spin-orbit scattering
- ↑ Decker, D. L. Laquer, H. L. (1969), Magnetization Studies on Superconducting Vanadium‐Gallium (PDF), doi:10.1063/1.1658081
- ↑ Hong, Minghwei (1980), A15 SUPERCONDUCTORS THROUGH DIRECT ""SOLID-STATE"" PRECIPITATION: V3Ga AND N63AI