The specific method of introducing lead significantly influences the phase development and superconducting properties of Pb-doped Bi2Sr2Ca2Cu3Ox (BSCCO-2223) Ag-sheathed powder-in-tube tapes. This is demonstrated in a study of tapes made from a series of powder mixtures containing the phases Bi1.8PbzSr2.0Ca1.0Cu2.0 O8 (2212), Ca2PbO4, Ca2CuO3, and CuO, where the lead content of 2212, z, was varied from 0.0 to 0.4. The overall composition of each mixture was the same, (Bi1.8Pb0.4Sr2.0Ca2.0Cu 3.0O10), and the amounts of each phase were varied to compensate for changes in z. In an additional mixture made from lead-free 2212, Ca2CuO3, and CuO, all lead was added as PbO. A significantly more complete 2223 formation, sharper transition temperatures, and higher critical current densities were seen when all lead was incorporated in the 2212 phase, rather than being added as either PbO or Ca2PbO4.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering