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In this study, we fabricated mono, 7, 19, 37 and 61 filamentary Bi2223 tapes sheathed with the Ag–Cu alloy, and several compositions with different Cu content were selected for precursor powders. The effect of the filament thickness and the initial composition of the precursor powder on the microstructure as well as the J c properties was investigated. It was found that the multifilamentary...