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Role of pO2 in microstructural development and properties of YBa2Cu3Ox superconductors

Published online by Cambridge University Press:  31 January 2011

J.P. Singh ,
R.A. Guttschow ,
J.T. Dusek  and
R.B. Poeppel
J.P. Singh
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
R.A. Guttschow
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
J.T. Dusek
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
R.B. Poeppel
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
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Abstract

An evaluation of the effects of oxygen partial pressure (pO2) on sintering behavior and the resulting microstructure of YBa2Cu3Ox (YBCO) indicates that sintering kinetics are enhanced at reduced pO2. The density of specimens sintered at 910 °C increased from 79 to 94% theoretical when pO2 was decreased from 0.1 to 0.0001 MPa. It is believed that increase in density with decrease in pO2 is the result of enhanced sintering kinetics, due probably to increased defect concentration, decreased activation energy of the rate-controlling species, and possibly the presence of a small amount of liquid phase. Sintering at 910 °C resulted in a fine-grain microstructure, with an average grain size of ≍4 μm. Such a microstructure results in reduced microcracking. Consequently, strength as high as 191 MPa is achieved. Reduced microcracking may have important implications for developing microstructures with improved critical current density.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 9 , September 1992 , pp. 2324 - 2332
Copyright
Copyright © Materials Research Society 1992

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