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The production of high performance YBa2Cu3O7 using nitrogen dioxide

Published online by Cambridge University Press:  31 January 2011

Kevin J. Leary ,
Howard W. Jacobson ,
Nancy F. Levoy ,
Richard A. Lapalomento ,
Thomas R. Askew ,
Richard B. Flippen ,
Steven W. Keller  and
Angelica M. Stacy
Kevin J. Leary
Affiliation:
Chemicals and Pigments Department, E.I. du Pont de Nemours & Co., Inc., Wilmington, Delaware 19880-0304
Howard W. Jacobson
Affiliation:
Chemicals and Pigments Department, E.I. du Pont de Nemours & Co., Inc., Wilmington, Delaware 19880-0304
Nancy F. Levoy
Affiliation:
Chemicals and Pigments Department, E.I. du Pont de Nemours & Co., Inc., Wilmington, Delaware 19880-0304
Richard A. Lapalomento
Affiliation:
Chemicals and Pigments Department, E.I. du Pont de Nemours & Co., Inc., Wilmington, Delaware 19880-0304
Thomas R. Askew
Affiliation:
Central Research and Development Department, E.I. du Pont de Nemours & Co., Inc., Wilmington, Delaware 19880-0304
Richard B. Flippen
Affiliation:
Central Research and Development Department, E.I. du Pont de Nemours & Co., Inc., Wilmington, Delaware 19880-0304
Steven W. Keller
Affiliation:
Department of Chemistry, University of California, Berkeley, and Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720
Angelica M. Stacy
Affiliation:
Department of Chemistry, University of California, Berkeley, and Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720
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Abstract

Energy Dispersive X-ray Spectroscopy (EDS) was used to show that the elemental homogeneity of YBa2Cu3O7 powders can be improved substantially by heating the powder in a nitrogen dioxide-containing atmosphere (e.g., 950°C), followed by annealing in oxygen at 950°C, and slow-cooling to room temperature. The improved homogeneity results in a substantially larger flux exclusion signal for the NO2-treated powder, as measured by both ac and dc techniques. The experimental results suggest a mechanism which involves the formation of a small amount of molten Ba(NO3)2, which acts as a flux that dissolves the constituents and reprecipitates them as high purity YBa2Cu3O7.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 1 , January 1990 , pp. 22 - 26
Copyright
Copyright © Materials Research Society 1990

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References

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