Abstract
The effect of bismuth partial substitution by lead, cadmium or tin on the properties of the polycrystalline systems Bi 2-x M x Sr 2 Ca 2 Cu 3 O z (M = Pb, Cd or Sn) was investigated. The samples were obtained from amorphous precursors by heat treatment applied in several stages. X-ray diffraction analysis and static susceptibility measurements were carried out in order to characterize the structure and to check the superconducting properties of the investigated samples. Superconducting behavior above liquid nitrogen temperature was evidenced only for the partial substitution of Bi with x = 0.2 Pb and x = 0.1 Sn.
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