Critical Current Characteristics of Bi2212 Round Wires Prepared by Isothermal Partial Melting Method

We prepared Bi2212 round wires using the isothermal partial melting process, in which partial melting and solidification are carried out at the same temperature but in changing oxygen partial pressure. We found that the homogeneity of Bi2212 phase inside the wire was important for the J _c performance of the wire and the homogeneity was improved by extending the heat treatment time. The J _c value of 6.6times10⁴ A/cm² at 4.2 K and 10 T were obtained. We can expect further enhancement of J _c property by optimizing the heat treatment conditions and improving the homogeneity of Bi2212 filaments of the wires.