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Electron microscopy study of interfacial structure and reaction of Yba2Cu3O7/Y-ZrO2 films on LaAlO3 substrates

Published online by Cambridge University Press:  31 January 2011

J. Y. Dai ,
F. H. Kaatz ,
P. R. Markworth ,
D. B. Buchholz ,
X. Liu ,
W. A. Chiou  and
R. P. H. Chang
J. Y. Dai
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
F. H. Kaatz
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
P. R. Markworth
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
D. B. Buchholz
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
X. Liu
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
W. A. Chiou
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
R. P. H. Chang
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
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Abstract

The detailed structure and interfacial reaction of epitaxial Yba2Cu3O7/Y-ZrO2 (YBCO/YSZ) films grown by chemical vapor deposition (CVD) on LaAlO3 (LAO) substrates are investigated by means of high-resolution electron microscopy (HREM), analytical transmission electron microscopy, and scanning transmission electron microscopy (STEM). The epitaxial relations of YBCO/YSZ/LAO are [100]YBCO // [110]YSZ // [100]LAO and (001)YBCO // (001)YSZ // (001)LAO. The optimum atomic configuration at the YSZ/LAO interface, in which oxygen is the first atomic layer on LAO, is proposed by using HREM combined with image simulation based on the atomic structure models of the interface. Near the YBCO/YSZ interface, two localized interfacial reaction products are formed: (i) a Y-rich modulated ZrO2 structure at the surface of the YSZ film, which may be caused by the diffusion of Y into the YSZ grains; (ii) an intergranular BaZrO3 phase formed by the diffusion of Ba along the columnar grain boundaries of the YSZ film during YBCO growth.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 6 , June 1998 , pp. 1485 - 1491
Copyright
Copyright © Materials Research Society 1998

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