Abstract
The Ba-doped superconducting (Bi,Pb)2Sr2-xBaxCa2Cu3Oy and (Bi,Pb)2Sr2Ca2-xBaxCu3Oy (0 ≦x≦ 1.0) were prepared by using a melt-quenching method, and the effect of Ba additions on the glass-forming ability and the crystalline phase was examined. The glass-forming ability was not improved by substitution of Ba for Sr or Ca, and particularly BaPbO3 as well as CaO was observed in the melt-quenched sample of (Bi,Pb)2SrBaCa2Cu3Oy. BaPbO3 crystals were precipitated in all glass-ceramics with Ba substituted for Sr or Ca. The partial substitution of Ba substituted for Sr was effective for the formation of the high-Tc phase, and (Bi,Pb)2Sr1.4Ba0.6Ca2Cu3Oy glass-ceramics obtained by annealing at 830°C for 100 h exhibited superconductivity with a Tc of 103 K, although BaPbO3 and the low-Tc phase were still largely present.
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