Effect of filament configuration and heat treatment of Bi2212/Ag round wire with low Ag ratio on the engineering critical current density (Je) was reported. We have fabricated 557, 85 7, and 121 7 wires with different Ag ratio and evaluated at various wire diameters. We have also changed the parameters of heat treatment. The effects of maximum process temperature (Tmax)and soaking time at Tmaxand average filament diameter on the Jewere also studied. 121 7 wire of 0.95 mm diameter heat-treated at showed Jeof 858mm2at 4.2K, 0 T.
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Kim et al. (2008) studied this question.
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