Abstract
High temperature superconductors, namely Tl0.6⋅ Pb0.4Ba2−xSrxCa2Cu3O9−δ, have successfully been prepared by the solid state reaction method. The substitutions for this compound were taken as x=0.0, 0.10, 0.20, 0.30, 0.40 and 0.50. The optimum calcination was at 1073 K and for sintering was within 1128–1133 K. Electrical resistivity, using the four-probe technique, was used to find the transition temperature Tc. The highest Tc(offset) was 113 K for Tl0.6Pb0.4Ba1.5Sr0.5Ca2Cu3O8.76. All samples were prepared by using O2 flow. X-ray diffraction (XRD) analysis have shown a pseudotetragonal structure with an increase of the c-axis lattice constant for the samples which were doped with Sr as compared to those which have no Sr content.
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