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The formation of superconducting phases in Bi(Pb)–Sr–Ca–Cu oxide/Ag microcomposites produced by oxidation of metallic precursor alloys

Published online by Cambridge University Press:  31 January 2011

Wei Gao ,
Songcun Li ,
Ron Parrella ,
David A. Rudman  and
John B. Vander Sande
Wei Gao
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Songcun Li
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Ron Parrella
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
David A. Rudman
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
John B. Vander Sande
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Abstract

Metallic alloy ribbons of Bi–Sr–Ca–Cu with nominal compositions of 2-2–1-2, 2-2–2-3, 2-2–2-4, and 2-2–3-4, with or without Pb, were made by vacuum induction melting followed by melt-spinning. Ag, at the level of 20–80 wt. %, was added to aid in the alloy melting and metallic ribbon formation processes. These ribbons were then subjected to a controlled atmosphere oxidation and annealing to produce superconducting oxide/silver microcomposites. Among the four alloy groups investigated in the present work, 2-2–3-4 alloys with 0.6Bi replaced by Pb possess the best superconducting properties after suitable treatment. These specimens exhibited zero resistance at T = 104–110 K and a critical current density of 600 A/cm2 at 77 K in zero field with excellent reproducibility. The annealing conditions, namely the annealing temperature, time, and atmosphere, are discussed in terms of the formation kinetics of the superconducting phases. While the 85 K Tc “2212” phase formed over a wide temperature range (740 to 845 °C) after an ∼2 h anneal, the 110 K high-Tc transition appeared only after an ∼10 h anneal at 810–840 °C, suggesting that the “2223” phase grew from the 2212 phase controlled by diffusion. The microstructures of these superconducting microcomposites were observed and analyzed by a combination of optical and scanning electron microscopy, x-ray powder diffraction, and electron probe microanalysis. The high Tc “2223” phase exhibited plate-like grains which were distributed randomly in orientation. The silver addition improved the mechanical properties of the metallic precursor ribbons and the superconducting microcomposites, promoted the formation of the 2223 phase, and influenced the oxidation and the annealing conditions.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 11 , November 1990 , pp. 2633 - 2645
Copyright
Copyright © Materials Research Society 1990

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References

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