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Synthesis of C-oriented YbBa2Cu3O7-δ Films on Single and Polycrystalline Substrates by Oxidation of Liquid Alloys

Published online by Cambridge University Press:  25 February 2011

J. S. Luo ,
N. Merchant ,
V. A. Maroni ,
D. M. Gruen ,
B. S. Tani ,
K. H. Sandhage  and
C. A. Craven
J. S. Luo
Affiliation:
Argonne National Laboratory, Argonne, IL. 60439
N. Merchant
Affiliation:
Argonne National Laboratory, Argonne, IL. 60439
V. A. Maroni
Affiliation:
Argonne National Laboratory, Argonne, IL. 60439
D. M. Gruen
Affiliation:
Argonne National Laboratory, Argonne, IL. 60439
B. S. Tani
Affiliation:
Argonne National Laboratory, Argonne, IL. 60439
K. H. Sandhage
Affiliation:
American Superconductor Corporation, Watertown, MA 02172
C. A. Craven
Affiliation:
American Superconductor Corporation, Watertown, MA 02172
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Abstract

Textured superconducting films of YbBa2Cu3O7-δ supported on single and polycrystalline substrates were prepared by oxidation of a liquid precursor alloy. The substrates were coated by dipping them into a molten alloy (YbBa2Cu3, m.p. ∼870°C), withdrawing them from the melt, then oxidizing the adhering liquid alloy layer to the corresponding oxide phase, i.e., YbBa2Cu3O7-δ. Samples prepared in this way exhibited a superconducting transition at ∼80 K following annealing in pure O2 at 500°C. With SrTiO3 (100) and MgO (100) substrates, evidence was seen for the epitaxial growth of YbBa2Cu3O7-δ crystals having their c-axis parallel to the [100] direction of the substrate. For polycrystalline MgO, x-ray diffraction and microstructural examination showed that the high-Tc crystallites in the films were also oriented with their c-axis perpendicular to the substrate surface, but the a and b axes directions were randomly oriented rather than epitaxial.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 249: Symposium Q – Synthesis and Processing of Ceramics: Scientific Issues , 1991 , 195
Copyright
Copyright © Materials Research Society 1992

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References

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