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High-TC Superconducting Oxide Films Produced from Solution Precursors

Published online by Cambridge University Press:  28 February 2011

Emanuel I. Cooper ,
Margaret A. Frisch ,
Edward A. Giess ,
Arunava Gupta ,
Brian W. Hussey ,
Eugene J.M. O'Sullivan ,
Stanley I. Raider  and
Gerald J. Scilla
Emanuel I. Cooper
Affiliation:
IBM T.J. Watson Research Center P.O. Box 218, Yorktown Heights, NY 10598.
Margaret A. Frisch
Affiliation:
IBM T.J. Watson Research Center P.O. Box 218, Yorktown Heights, NY 10598.
Edward A. Giess
Affiliation:
IBM T.J. Watson Research Center P.O. Box 218, Yorktown Heights, NY 10598.
Arunava Gupta
Affiliation:
IBM T.J. Watson Research Center P.O. Box 218, Yorktown Heights, NY 10598.
Brian W. Hussey
Affiliation:
IBM T.J. Watson Research Center P.O. Box 218, Yorktown Heights, NY 10598.
Eugene J.M. O'Sullivan
Affiliation:
IBM T.J. Watson Research Center P.O. Box 218, Yorktown Heights, NY 10598.
Stanley I. Raider
Affiliation:
IBM T.J. Watson Research Center P.O. Box 218, Yorktown Heights, NY 10598.
Gerald J. Scilla
Affiliation:
IBM T.J. Watson Research Center P.O. Box 218, Yorktown Heights, NY 10598.
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Abstract

Superconducting films of Ba2RECu3O7−x were prepared from aqueous and aqueous-alcoholic mixed solutions of barium, rare earth (RE), and copper nitrates. The solutions were sprayed onto heated (100) orientated MgO, ZrO2 —9%Y2O3 and SrTiO3 substrates to form a dehydrated nitrate precursor; subsequent thermal treatment yielded the superconducting 2:1:3 compound. Earlier magnetic film studies with aqueous-alcoholic mixed solutions of rare-earth iron garnet precursors showed that alcohol improves the spreading and drying of solutions on substrates. Here, however, alcohol significantly lowers the solubility of Ba(NO3)2. Some compositions tend to phase segregate during film preparation. A key objective of this study was to understand reaction paths of the precursors in order to optimize the furnace annealing schedule. Film and substrate reactions complicate the process, especially for SrTiO3, which otherwise has a good lattice match with films. Analytical methods used were Knudsen effusion mass spectrometry, thermogravimetric analysis, x-ray diffraction, secondary ion mass spectroscopy, electron microscopy and temperature-dependent resistivity. The best samples showed a Tc of 95K and had zero resistivity below 89K. Advantages of this process include: simplicity of equipment, short deposition time; ease of making composition adjustments; and possible deposition on complex shapes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 165
Copyright
Copyright © Materials Research Society 1988

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References

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