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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.

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Articles
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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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