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CO2 decomposition kinetics of YBa2Cu3O7−x via in situ electrical conductivity measurements

Published online by Cambridge University Press:  31 January 2011

E.A. Cooper ,
A.K. Gangopadhyay ,
T.O. Mason  and
U. Balachandran
E.A. Cooper
Affiliation:
Northwestern University, Department of Materials Science and Engineering and Science and Technology Center for Superconductivity, Evanston, Illinois 60208
A.K. Gangopadhyay
Affiliation:
Northwestern University, Department of Materials Science and Engineering and Science and Technology Center for Superconductivity, Evanston, Illinois 60208
T.O. Mason
Affiliation:
Northwestern University, Department of Materials Science and Engineering and Science and Technology Center for Superconductivity, Evanston, Illinois 60208
U. Balachandran
Affiliation:
Argonne National Laboratory, Materials and Components Technology Division and Science and Technology Center for Superconductivity, Argonne, Illinois 60439
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Abstract

In situ electrical conductivity measurements were employed to study the kinetics of decomposition of YBa2Cu3O7−x in flowing 5% CO2/95% O2 atmosphere at 815 °C. Three regimes could be observed in the decay of the conductivity with time, interpreted as corresponding to nucleation over the initial 5–10 min, rapid formation of Y2Cu2O5, BaCO3, and CuO between 10 min and 1 h, and finally transition to the formation of Y2BaCuO5, BaCO3, and CuO at longer times. The absence of dispersion in impedance measurements as a function of frequency together with the gradual decay of conductivity (roughly corresponding to the remaining volume fraction of YBa2Cu3O7−x) indicates that not all grain boundaries are involved in the decomposition process.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 7 , July 1991 , pp. 1393 - 1397
Copyright
Copyright © Materials Research Society 1991

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References

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