Abstract
The effects of the number of times for the calcinations and of the cooling rate are investigated to develop the fabrication technique of Bi-system superconductor. A temperature just below the softening of the specimen is selected as a calcinating and a sintering temperature. The content of Pb additive is substituted for 20%of Bi. The measurements of the magnetic susceptibility, resistivity, critical temperature, critical current, X-ray diffraction and SEM observation of the superconducting phase are carried out. From the results of the experiments to investigate the effect of the conditions of the calcination and cooling rate, the specimen after a second calcination and 0.1°C /min cooling rate shows good superconductivity and the critical current density Jc=49A/cm2.
