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The microstructure and superconducting properties of Bi-2212 wires seem to be strongly influenced by the nominal composition of the starting powder. We fabricated Bi-2212 round wires with different starting compositions. The highest Jc values of 175 kA/cm2 at 4.2 K and 10 T were obtained in the Bi-rich sample with a Bi-rich composition. We carried out quenching experiments from the melting state of Bi-2212. We observed obviously smaller grains of impurity phases in the wire with high Jc than in the low-Jc wires in the melting state, which suggested that this is one of the reasons for the enhancement of the Jc values in these wires.
Date of Publication: June 2011