Preparation and Characterization of Hot-Pressed and Sintered BiPbSrCaCuO Superconductor

Abstract

Powder compacts of the system Bi 2-x Pb x Sr 2 Ca 2 Cu 3 O y with 0 ≤ x ≤ 0.5 molar ratio using both techniques; isothermal hot pressing and the solid state reaction (sintering). The XRD of the hot pressed powder compacts of the nominal compositions Bi 2-x Pb x Sr 2 Ca 2 Cu 3 O y showed 2212 and 2223 phases. The resistivity temperature variations belonging to the composition Bi 1.8 Pb 0.2 Sr 2 Ca 2 Cu 3 O y showed metal-superconducting transition at T ons = 143 K for the annealed sample for 24 h. The annealed nominal composition Bi 1.5 Pb 0.5 Sr 2 Ca 2 Cu 3 O y for 18 h showed metal to superconducting transition at 80 K.