Abstract
Superconducting Bi 2−xPb xSr 2CaCu 2O x (noted Bi,Pb(2212)) has been processed in air at 860°C with a nominal composition of Bi 1.72Pb 0.34Sr 1.83Ca 0.97Cu 2.13O x in contrast to the literature where this phase was produced in argon around 740°C. With the aim of transforming this phase into Bi,Pb(2223) (another Bi-containing superconductor), Bi,Pb(2212) has also been mixed with Ca 2CuO 3 and CuO. A critical temperature T c of 95K was obtained for pure Bi,Pb(2212). On the basis of DTA/TG and X-ray diffraction measurements, we can conclude that pure Bi,Pb(2212) melts at 882°C. If secondary phases are added, Pb leaves the Bi,Pb(2212) crystal structure around 400°C and it is again incorporated above 835°C until the phase melts at 876°C, a temperature somewhat lower due to compositional effects.
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