Synthesis of superconducting 2212 phase in the Bi-Pb-Sr-La-Cu-O system

There have been no report about synthesis of the Bi-2212 compound in the Bi-Sr-La-Cu-O system. We have succeeded in synthesizing the Bi-2212 compound by partial substitution of Pb for Sr and/or Bi in the Bi-Sr-La-Cu-O system. Two samples of nearly the single 2212 phase have been obtained at a nominal composition of Bi(1.5)Pb(0.5)Sr(2.5)La(0.5)Cu(2)O(z). Both of the samples crystallize in a psedotetragonal lattice, and their lattice parameters are a = 0.5476 nm and c = 3.085 nm or a = 0.5479 nm and c = 3.055 nm. They are both superconductors. The sample with longer lattice parameter c shows an onset of the resistivity drop and zero resistivity at higher temperatures of about 40 K and about 13 K, respectively. This sample also shows a diamagnetic signal starting at about 35 K with lowering temperature.