Bi-Pb-Sr-Ca-Cu-O系高Tc相焼結体の超伝導特性に及ぼすLi₂CO₃添加効果

抄録

Samples with a composition of Bi₁.₈Pb₀.₄Sr₂Ca₂Cu_3.2LixOy(x=0 to 0.1) were pressformed at 196MPa and heat-treated at 825 to 850°C for 20h and these steps were repeated 3 times without pulverazation. The highest value of Tc(106K) was obtained for the samples with x=0.01 and 0.05 sintered at 840°C. On the other hand, the highest value of Jc(77K, OT) was obtained for the sample with x=0.01 sintered at 845°C. The values of Tc and Jc were decreased for all samples sintered at 825 and 850°C. The Li-addition promoted the formation of high-Tc phase and gave higher value of Jc and better sinterability.