SUPERCONDUCTING PROPERTIES OF MULTILAYERED BI(PB)-2223 AG TAPES/

The preparation of silver sheathed Bi(Pb)-2223 multilayered tapes, fab ricated by a new route-called the 'accordion folding method'-and throu gh intermediate rolling and sintering processes, is reported. The elec trical properties of these tapes were determined by transport J(c) mea surements in applied fields up to 23 T and up to 0.5 T, at 4.2 K and 7 7 K respectively. Multilayered tapes, having up to ten high-temperatur e superconducting layers, exhibited large transport current capabiliti es I-c up to 300 A and critical current densities as high as 8.8 x 10( 3) A cm(-2) at 77 K in self-field. Magnetic J(c) values, calculated fr om magnetization loops in a wide range of temperature, are in accordan ce with transport measurements below 30 K. Electrical and magnetic pro perties were also correlated with the processing parameters and compar ed with those of monofilamentary tapes.