Superconducting Properties of Barium-Doped (Bi,Pb) sub 2 Sr sub 2 Ca sub 2 Cu sub 3 O sub x Glass-Ceramics

The Ba-doped superconducting (Bi,Pb) sub 2 Sr sub 2--x Ba sub x Ca sub 2 Cu sub 3 O sub y and (Bi,Pb) sub 2 Sr sub 2 Ca sub 2--x Cu sub 3 O sub y (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 ph...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1992-07, Vol.75 (7), p.1864-1869
Main Authors: Komatsu, T, Ueta, M, Ohki, T, Sato, R, Matsusita, K
Format: Article
Language:English
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Summary:The Ba-doped superconducting (Bi,Pb) sub 2 Sr sub 2--x Ba sub x Ca sub 2 Cu sub 3 O sub y and (Bi,Pb) sub 2 Sr sub 2 Ca sub 2--x Cu sub 3 O sub y (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 BaPbO sub 3 and CaO was observed in the melt-quenched sample of (Bi,Pb) sub 2 SrBaCa sub 2 Cu sub 3 O sub y . BaPbO sub 3 crystals were precipitated in all glass-ceramics with Ba substituted for Sr or Ca. The partial substitution of Ba for Sr was effective for the formation of the high-T sub c phase, and (Bi,Pb) sub 2 Sr sub 1.4 Ba sub 0.6 Ca sub 2 Cu sub 3 O sub y glass-ceramics obtained by annealing at 830 deg C for 100 h exhibited superconductivity with a T sub c of 103K, although BaPbO sub 3 and the low-T sub c phase were still largely present.
ISSN:0002-7820