Abstract
A set of multifilament Bi-2223/Ag tapes were fabricated by varying the lead content and calcination temperature of starting precursors. The influence of precursor conditions on the phase formation, microstructure and J c property of Bi-2223/Ag tapes were explored with XRD, DTA, SEM-EDS and transport current measurements. The results showed that the Pb content of 0.20 in the nominal composition of Bi 1.8Pb x Sr 2.0Ca 2.2Cu 3.0O z is too low to lead to a fully formation of Bi-2223 phase in tapes compared with Pb content of 0.25 and 0.30. In addition, despite the Pb variations, the powders calcined at 820 °C resulted in the highest J c in final tapes against the powders calcined at 810 and 830 °C. The correlation between the transport property and the varied phase assemblages of precursors induced by lead and calcination temperature variations was discussed.
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