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A15 Nb/sub 3/(AlGe) superconductors prepared by transformation from liquid quenched body-centered cubic phase

Journal Article · · Appl. Phys. Lett.; (United States)
DOI:https://doi.org/10.1063/1.93461· OSTI ID:5228449
A supersaturated body-centered cubic (bcc) solid solution of Nb/sub 3/(Al/sub 1-x/Ge/sub x/) up to x = 0.3 has been prepared by the liquid quenching on a hot Cu substrate. The quenched materials are then transformed to the A15 structure by annealing above 800 /sup 0/C. Following the transformation, the critical temperature rises above 18 /sup 0/K. The A15 phase converted from the bcc phase has an extremely small grain size of a few hundred angstroms, resulting in a high critical current density J/sub c/ in high magnetic fields. J/sub c/ of 3.5 x 10/sup 5/ A/cm/sup 2/ at 4.2 /sup 0/K and 16 T has been achieved in the Nb/sub 3/(Al/sub 0.8/Ge/sub 0.2/) sample annealed at 850 /sup 0/C for 7 h.
Research Organization:
National Research Institute for Metals, 1-2-1, Sengen, Sakura-mura, Niihari-gun, Ibaraki 305, Japan
OSTI ID:
5228449
Journal Information:
Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 41:2; ISSN APPLA
Country of Publication:
United States
Language:
English

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