Abstract
Bi 2−ZPb zSr 2−x(La/Nd) xCuO y (z=0 and 0.4, x=0.2–1.0) was synthesized in air and nitrogen atmosphere. Valence analyses by dichromate titration and iodometry showed Bi valence larger than 3.0 and Cu valence close to 2+ over the wide range of x, being difficult to explain superconductivity. The Tc depends on substituent lanthanoid, La or Nd. The maximum Tc was achieved at x=0.4–0.5 in all these series.
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