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Preparation, thermal processing behavior, and characterization of YBCO from freeze-dried nitrate precursorsa)

Published online by Cambridge University Press:  31 January 2011

N.V. Coppa ,
G.H. Myer ,
R.E. Salomon ,
A. Bura ,
J.W. O'Reilly ,
J.E. Crow  and
P.K. Davies
N.V. Coppa
Affiliation:
Exploratory Research and Development Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
G.H. Myer
Affiliation:
Center for Materials Science, Temple University, Philadelphia, Pennsylvania 19122
R.E. Salomon
Affiliation:
Center for Materials Science, Temple University, Philadelphia, Pennsylvania 19122
A. Bura
Affiliation:
Center for Materials Research and Technology, Florida State University, Tallahassee, Florida 32306-3016
J.W. O'Reilly
Affiliation:
Center for Materials Research and Technology, Florida State University, Tallahassee, Florida 32306-3016
J.E. Crow
Affiliation:
Center for Materials Research and Technology, Florida State University, Tallahassee, Florida 32306-3016
P.K. Davies
Affiliation:
Department of Materials Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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Abstract

YBCO was synthesized using atomically mixed nitrate precursors. Atomic mixing was achieved using a freeze-dried process which is fully discussed here. The thermal processing behavior of these precursors is fundamentally different from that of mechanical mixtures of the Y, Ba, and Cu oxides and it is examined in detail. Ba2Cu3O5+x (normally considered a high oxygen pressure phase) and Y2O3 formed as nitrate decomposition products at ambient atmospheric conditions. Subsequent reaction of these materials (2 h at 925 °C) produced polycrystalline YBCO. Without any post-processing of the powders, product YBCO powders consisted of 30 μm agglomerates composed of crystals 1–3 μm on an edge. The powdered products exhibited a magnetic susceptibility greater than 90% – 1/4π.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 8 , August 1992 , pp. 2017 - 2026
Copyright
Copyright © Materials Research Society 1992

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