鈴木 晶雄

The effect of Ag addition (0-100 wt%) to Bi2-xPb xSr2Ca2Cu3Oy (x=0.1-1.0) was systematically studied using differential thermal analysis (DTA), electrical resistivity, change in inductance, scanning electron microscopy (SEM) and X-ray diffraction (XRD) studies. The sample was prepared by the optimum thermal procedure in which the sintering was done at the endothermic peak temperature judging from the DTA curve. It was found that the 110 K phase was produced with good reproducibility by the lowering of the melting temperature due to the addition of Ag. It was also found that high-Tc (end) corresponded well to the high-Tc fraction m= Sigma H/( Sigma H+ Sigma L+ Sigma l) (H: 2223, L: 2212, l: Ca2PbO4, Ca2CuO 3) defined from the result of XRD measurements.

The high Tc phase (110 K) of the Bi2-xPb xSr2Ca2Cu3Oy system has been synthesized and the optimum thermal procedure for the preparation of 110 K phase has been studied extensively using differential thermal analysis (DTA), electrical resistivity, change in inductance, scanning electron microscopy (SEM) and X-ray diffraction studies (XRD). It was found that the best result was obtained for the sample with x=0.2 sintered at the temperature of the endothermic peak of the DTA curve.