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Some Aspects of the Nonstoichiometric and Thermodynamic Behavior of the YBa2Cu3Oz System

Published online by Cambridge University Press:  21 February 2011

M. Tetenbaum ,
L. Curtiss ,
B. Czech ,
B. Tani  and
M. Blander
M. Tetenbaum
Affiliation:
Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439
L. Curtiss
Affiliation:
Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439
B. Czech
Affiliation:
Summer 1988 Undergraduate Research Participant from Eastern Washington University, Cheney, Washington 99004
B. Tani
Affiliation:
Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439
M. Blander
Affiliation:
Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439
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Abstract

The nonstoichiometric and thermodynamic behavior of the YBa2Cu3Ox system as a function of oxygen partial pressure and temperature is being investigated by means of a coulometric titration technique. The oxygen content of the superconductor can be varied coulometrically by well-defined small amounts and the equilibrium partial pressures determined from the EMF. The oxygen stoichiometry in YBa2Cu3Ox as a function of oxygen partial pressure shows a change of curvature around x = 6.55–6.75 and an inflection around x ≅ 6.65 at temperatures between 400–500°C. These new low temperature data are consistent with the presence of a miscibility gap at lower temperatures, which is similar to that postulated in several theoretical papers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 156: Symposium M – High Temperature Superconductors: Relationships Between Properties, Structure, and Solid State Chemistry , 1989 , 83
Copyright
Copyright © Materials Research Society 1989

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References

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