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Carbon retention in YBa2Cu3O7–δ and its effect on the superconducting transition

Published online by Cambridge University Press:  31 January 2011

T. M. Shaw ,
D. Dimos ,
P. E. Batson ,
A. G. Schrott ,
D. R. Clarke  and
P. R. Duncombe
T. M. Shaw
Affiliation:
IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598
D. Dimos
Affiliation:
IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598
P. E. Batson
Affiliation:
IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598
A. G. Schrott
Affiliation:
IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598
D. R. Clarke
Affiliation:
IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598
P. R. Duncombe
Affiliation:
IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598
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Abstract

Magnetic susceptibility measurements are used to show that the superconducting transition temperature of yttrium barium cuprate is lowered by carbon trapped in the microstructure of dense polycrystalline materials during sintering. We show that carbon is retained in the material as a result of the porosity closing off during the sintering process. X-ray photoelectron spectroscopy and electron energy loss spectroscopy are used to show that the retained carbon forms a solid solution with YBa2Cu3O7–δ and resides in a barium carbonate-like configuration in the crystal structure. The origin of the lowering of the superconducting transition temperature and processing strategies for preventing carbon retention are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 6 , June 1990 , pp. 1176 - 1184
Copyright
Copyright © Materials Research Society 1990

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References

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