مرکز منطقه ای اطلاع رساني علوم و فناوري -

چكيده لاتين :

Ag clad dip-coated superconductor tapes were fabricated from T1-1212 superconducting powders of T10.8Bi0.2Sr2Ca0.8Y0.2Cu2O7 starting composition derived via two different methods; the conventional SolidState (SS) and coprecipitation (CP) methods. The effects of using superconducting powders derived from SS and CP methods on phase formation, microstructure and critical current density were investigated for tapes annealed at 850°C for 60 min in flowing O2. XRD analysis of the tapes oxide cores indicated a lower volume percentage of 1212 phase for the CP tape (84%) compared to the SS tape (97%). However, the transport Jc of the CP tape (4670 A cm^-2) was significantly higher than the SS tape (560 A cm^-2). The SEM micrograph of the CP tapeיs oxide core revealed partially melted microstructure with fused grains in contrast to the microstructure of the SS tapeיs core which shows porous microstructure with irregularly shaped grains. The higher Jc for the CP tape is suggested to be due to improved inter-grain connectivity as a result of the partial melting.