The microstructural and electrical properties of Ag clad BiyPb0.4Sr2Ca2Cu3Ox (y = 1.8, 2.0 and 2.3) powder-in-tube tapes were investigated. The highest Jc values (2000 A/cm2 at 77 K and 0 T) were obtained for tapes of powders y = 1.8 and 2.0 following a 150 h thermomechanical routine at 855°C. The presence of alkaline earth second phases was not diminished by the addition of bismuth. The phase equilibria were observed to shift from 2-2-2-3+ Sr14-xCaxCu24O48 + SrxCa2-xCuO3 to 2-2-2-3 + SrxCa2-xCuO3 + CuO as the Bi content was increased from y = 1.8 to 2.0. (Sr,Ca)2PbO4 and 2-2-1-2 were present as by-product phases at temperatures above and below 855°C. Higher Bi content (y = 2.3) caused formation of the 2-2-1-2 phase as the 2-2-2-3 became Bi-saturated.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering