Abstract
Pining characteristics due to the precipitates of the "3321"(Sr2.5Bi0.5Pb3Ca2CuOz) phase have been studied in the Bi-2223 phase in the Bi-Pb-Sr-Ca-Cu-O system by mainly XRD and magnetic measurements. The precipitation of the "3321" phase was controlled by changing annealing temperature and annealing time in air. On annealing at 750°C for 10min and 1h, the larger hysteresis loops in M-H curves were observed in comparison with the initial one before annealing. However, the hysteresis loops became smaller with increasing precipitation of the "3321 " phase. Furthermore, the 2223 phase annealed at 400°C and 500°C, in which no precipitation of the "3321 " phase was observed, exhibits larger hysteresis loops.
