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Epitaxial growth of YbBa2Cu3O7−δ films on (100)-oriented MgO and SrTiO3 substrates by oxidation of a liquid alloy precursor

Published online by Cambridge University Press:  31 January 2011

N. Merchant
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
J.S. Luo
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
V.A. Maroni
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
D.M. Gruen
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
B.S. Tani
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
S. Sinha
Affiliation:
University of Illinois, Chicago, Illinois 60607
K.H. Sandhage
Affiliation:
American Superconductor Corporation, Watertown, Massachusetts 02172
C.A. Craven
Affiliation:
American Superconductor Corporation, Watertown, Massachusetts 02172
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Abstract

Textured superconducting films of YbBa2Cu3O7−δ were grown on single crystals of MgO (100) and SrTiO3 (100) by oxidation of a liquid alloy precursor. The substrates were coated by dipping them in molten YbBa2Cu3 (m.p. ~870 °C). After removal from the melt, the liquid layers on the substrates were oxidized in pure oxygen to form the tetragonal oxide phase, i.e., YbBa2Cu3O7−δ, then annealed at 500 °C to obtain the superconducting orthorhombic phase of the same compound. The microstructure of the films obtained in this way was found to be related to the nature of the substrate as well as to processing variables that included oxidation temperature and oxidation time. Films grown on MgO (100) showed c-axis texture as well as a random growth structure. Films prepared on SrTiO3 (100) showed either a c-axis texture or a mixture of c-axis and a-axis texture. The superconducting properties of the as-prepared films and the effects of key process parameters on film quality and microstructure are presented and discussed.

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Articles
Copyright
Copyright © Materials Research Society 1992

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References

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