Synthesis and Magnetic Properties of Bi2Sr2CaCu2Oy Superconductor by Using Nitrate Precursors

Bi2Sr2CaCu2Oy (Bi-2212) bulk samples were synthesized by solid-state reaction method using nitrate precursors and systematically studied for their magnetic properties. The nitrate precursor facilitates the formation of Bi-2212 phase at 830 °C. The XRD study confirms the formation of Bi-2212 phase. The SEM study reveals the development of grains with the plate-like structure. The dc susceptibility measurement results showed that the superconducting transition occurs at temperature 82 K. The critical current density measurements under applied magnetic field in temperature range of 70 to 10 K show the rapid decrease in current density above 35 K, which indicates weak link behavior. The sample synthesized by this technique showed the better irreversibility field than earlier reported in literature.