Electrical and magnetic properties of the superconducting oxides with nominal composition (Bi0.7 Pb0.3) 2Sr 2Ca2 Cu3 Ox prepared from polymeric precursors have been investigated. Superconducting transition with zero-resistance temperature at T=108 K was achieved for a sample sintered at 840 °C under a low oxygen pressure. The critical current density at 77 K in a zero magnetic field is ∼400 A/cm2, which is much higher than that of the Pb-free sample. Variations of the superconducting transition temperature, the critical current density, and magnetic properties with heat treatment time are discussed in connection with the structural properties.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)