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Magnetic, electrical, and microstructural properties of YBa2Cu3O7: A comparison of sol-gel, co-precipitated, and solid state processing routes

Published online by Cambridge University Press:  31 January 2011

E. A. Hayri ,
M. Greenblatt ,
K. V. Ramanujachary ,
M. Nagano ,
J. Oliver ,
M. J. Miceli  and
R. Gerhardt
E. A. Hayri
Affiliation:
Department of Chemistry, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
M. Greenblatt
Affiliation:
Department of Chemistry, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
K. V. Ramanujachary
Affiliation:
Department of Chemistry, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
M. Nagano
Affiliation:
Department of Chemistry, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
J. Oliver
Affiliation:
Department of Ceramic Engineering, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
M. J. Miceli
Affiliation:
Department of Ceramic Engineering, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
R. Gerhardt
Affiliation:
Department of Ceramic Engineering, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
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Abstract

Samples of YBa2Cu3O7 were prepared by sol-gel, co-precipitation, and solid state processes. Sol-gel samples were prepared from a solution of yttrium, barium, and copper nitrates dissolved in ethylene glycol, co-precipitated samples were made by the amorphous citrate method, and solid state samples were prepared by conventional high temperature reaction of the appropriate metal oxides and carbonates. The sol-gel process was shown to yield superconducting samples of superior Meissner effect, critical current, and critical field. The co-precipitated samples contain impurities that affect the critical properties. The sol-gel and co-precipitated processes yield materials with well-formed, plate-like particles with a fairly uniform size of about 10 μm. The grains in the solid state sample are smaller but have a much wider distribution of sizes than the samples prepared by solution methods.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 5 , October 1989 , pp. 1099 - 1102
Copyright
Copyright © Materials Research Society 1989

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References

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