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Cation Interdiffusion at YBCO/MgO Interfaces

Published online by Cambridge University Press:  28 February 2011

M. Lanham ,
J. Mayer ,
S.J. Golden ,
F.F. Lange  and
M. Rühle
M. Lanham
Affiliation:
Materials Department, University of California, Santa Barbara, CA. 93106
J. Mayer
Affiliation:
Materials Department, University of California, Santa Barbara, CA. 93106
S.J. Golden
Affiliation:
Materials Department, University of California, Santa Barbara, CA. 93106
F.F. Lange
Affiliation:
Materials Department, University of California, Santa Barbara, CA. 93106
M. Rühle
Affiliation:
Max-Planck-Institut für Metallforschung, Stuttgart, West Germany.
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Abstract

Resistivity measurements of YBCO thin films on MgO substrates show that the transition to the superconducting state depends on film thickness. TEM investigations of the films revealed interdiffusion of Cu and Mg. The concentrations of the cations at the interface were quantitatively measured. These data show that their diffusion rates are much different (MgODCu/YBCODMg=30); this indicates that the diffusion mechanism is complicated by the layered structure of the perovskite-like films. No impurity segregation was detected at the interface. Diffraction study of several YBCO grains confirms that the film c-axis is oriented perpendicular to the substrate, but that the a/b plane has no fixed orientation, indicating that no epitaxial relationship exists.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 1173
Copyright
Copyright © Materials Research Society 1990

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References

1 Golden, S.J., Isotalo, H., Lanham, M., Mayer, J., Evans, A.G., Lange, F.F., and Rühle, M., Characterization of spray-pyrolized YBa2Cu3O7-x films on single crystal MgO by transmission electron microscopy, submitted to J. Matrl. Res. (1989).Google Scholar
2 Shewmon, P.G., Diffusion in Solids, (McGraw-Hill, New York, 1963), p. 12.Google Scholar