Electrical properties of multifilamentary Bi(Pb)-2223/Ag tapes

The electric and magnetic characterization of superconducting tapes of the 110 K phase Bi(Pb)-2223 (Bi/sub 1.7/Pb/sub 0.3/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/) fabricated by the powder-in-tube method and an intermediate rolling and sintering process are reported. Besides multifilamentary tapes, specimens with a new geometrical arrangement of the superconducting areas inside the silver matrix, showing large current capabilities, were fabricated. Wires and tapes with up to four concentric superconducting rings with transport critical current, I/sub c/, at 77.3 K and zero magnetic field higher than 85 A (corresponding to J/sub c/>9000 A/cm/sup 2/) and at 4.2 K and zero field higher than 400 A (corresponding to J/sub c/>40000 A/cm/sup 2/) were reproducibly obtained. Magnetic measurements were also compared with the above transport results.<>