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Superconducting and crystallographic properties of Bi,Pb(2212)

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Published in Physica C: Superconductivity and Its Applications. 1994, vol. 235-240, p. 943-944
Abstract Superconducting Bi2−xPbxSr2CaCu2Ox (noted Bi,Pb(2212)) has been processed in air at 860°C with a nominal composition of Bi1.72Pb0.34Sr1.83Ca0.97Cu2.13Ox 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 Ca2CuO3 and CuO. A critical temperature Tc 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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JEREMIE, Andréa, GRIVEL, Jean-Claude, FLUKIGER, René-Louis. Superconducting and crystallographic properties of Bi,Pb(2212). In: Physica C: Superconductivity and Its Applications, 1994, vol. 235-240, p. 943-944. https://archive-ouverte.unige.ch/unige:98902

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