Abstract
In this study, the thermal, structural and superconducting properties with lead and lead-free cerium added Bi 2 Sr 2 Ca 2 Cu 3 O δ superconducting system have been investigated. Cerium-added superconductors with the general stoichiometry of Bi 2-x Pb x Sr 2 Ca 2 Cu 3 Ce y O δ (x = 0 and 0.4 and y = 0, 0.1, 0.2 and 0.4) were prepared by the conventional solid state synthesis technique. The materials are characterized by DTA/TGA, XRD, SEM, EDX and R-T measurements. Although the desired phase is the Bi-2223 phase in the manufactured materials, it is observed that Bi-2212 phase predominates in some materials. Especially while being the Bi-2212 phase in Pb-free samples, the main phase is relatively Bi-2223 phase in Pb containing samples. Consequently, critical temperature values have also decreased and transition behavior has been observed in two steps.
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