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Decomposition of YBa2Cu3O7−x during annealing in CO2/O2 mixtures

Published online by Cambridge University Press:  31 January 2011

Y. Gao ,
K. L. Merkle ,
C. Zhang ,
U. Balachandran  and
R. B. Poeppel
Y. Gao
Affiliation:
Materials Science Division, Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439
K. L. Merkle
Affiliation:
Materials Science Division, Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439
C. Zhang
Affiliation:
Materials and Components Technology Division, Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439
U. Balachandran
Affiliation:
Materials and Components Technology Division, Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439
R. B. Poeppel
Affiliation:
Materials and Components Technology Division, Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439
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Abstract

The stability of YBa2Cu3O7−x superconductors toward reactions with CO2 in CO2/O2 gas mixtures has been studied during annealing at temperatures ranging from 600°C to 950°C. The results show that there are three different types of the reactions. The reaction products of these reactions all include BaCO3 and CuO, while the third product is dependent on the annealing temperature. At 600°C, YBa-carbonates were formed while Y2Cu2O5 and Y2BaCuO5 were formed at 815°C and 950°C, respectively. Transmission Electron Microscopy images show that the reactions started at grain boundaries with the formation of island-type precipitates.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 7 , July 1990 , pp. 1363 - 1367
Copyright
Copyright © Materials Research Society 1990

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