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One-Step Synthesis and Densification of Bulk YBa2Cu4O8/Ni Composite Superconductors

Published online by Cambridge University Press:  28 February 2011

C. Gélinas  and
B. Champagne
C. Gélinas
Affiliation:
National Research Council Canada, Industrial Materials Research Institute, 75 De Mortagne, Boucherville, Québec, Canada J4B 6Y4
B. Champagne
Affiliation:
National Research Council Canada, Industrial Materials Research Institute, 75 De Mortagne, Boucherville, Québec, Canada J4B 6Y4
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Extract

The fabrication of bulk YBa2Cu307-x/metal composite superconductors is not easy because of the oxygen-temperature dependence of the YBa2Cu307-x phase (the socalled 123 phase). A loss of oxygen occurs during consolidation of these composites at high temperature and it is almost impossible to diffuse oxygen through the metallic envelope into the densified compound to restore the required oxygen content for superconductivity above 77K. To overcome this drawback, a one-step synthesis and consolidation process was used to produce YBa2Cu4O8/ nickel composites. The superconductive 124 phase has a more stable oxygen stoichiometry [1] and is synthesized under a high oxygen pressure at high temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 369
Copyright
Copyright © Materials Research Society 1990

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References

1 Morris, D.E. et at., Phys. Rev. B 39, (1989) 7347–7350.Google Scholar
2 Karpinski, J. et al. , J. Less. Common Met., 150 (1989) 129–137.Google Scholar
3 Karpinski, J. et al. , J. Less– Common Met., 150 (1989) 207–210.Google Scholar
4 Morris, D.E. et al. , “Synthesis and properties of the 2:4:7 superconductors R2Ba4Cu7015–x (R = Y, Eu, Gd, Dy, Ho, Er)”, (to be published).Google Scholar
5 Champagne, B. et al. , Supercond. Sci. Technol. 2 (1989) 25–28.Google Scholar