Comparison of Intermediate Phase Evolution in Bi-2212 Powders Prepared by Spray Pyrolysis and Co-precipitation Methods for High Performance Wires

Bi2Sr2CaCu2O8+delta (Bi-2212) precursor powders were prepared by spray pyrolysis (SP) and co-precipitation (CP) processes separately. The intermediate phase evolution of Bi-2212 grains was investigated. Compared with that prepared by CP process, the phase formation rate of Bi-2212 grains prepared by SP process is obviously improved. Furthermore, the residual carbonates in CP powders hinder the formation of Bi-2212 grains, while the nitrates in SP powders only have a weak influence on the growth of Bi-2212 grains. The properties of Bi-2212 wires from SP precursor powder are close to those of the ones from CP precursor powder. Considering the much higher fabrication efficiency, SP process is useful for mass production of Bi-2212 wires.

Automated summary

In this study, Bi-2212 precursor powders were prepared using spray pyrolysis and co-precipitation methods, and the intermediate phase evolution of Bi-2212 grains was investigated. The results showed that the phase formation rate of Bi-2212 grains prepared by spray pyrolysis was improved, while the residual carbonates in co-precipitation powders hindered the formation of Bi-2212 grains.