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Microstructural characterization of thick YBa2Cu3O7−δ films on improved rolling-assisted biaxially textured substrates

Published online by Cambridge University Press:  31 January 2011

K. J. Leonard ,
S. Kang ,
A. Goyal ,
K. A. Yarborough  and
D. M. Kroeger
K. J. Leonard
Affiliation:
Oak Ridge National Laboratory, Metals and Ceramics Division, Oak Ridge, Tennessee 37831-6116
S. Kang
Affiliation:
Oak Ridge National Laboratory, Metals and Ceramics Division, Oak Ridge, Tennessee 37831-6116
A. Goyal
Affiliation:
Oak Ridge National Laboratory, Metals and Ceramics Division, Oak Ridge, Tennessee 37831-6116
K. A. Yarborough
Affiliation:
Oak Ridge National Laboratory, Metals and Ceramics Division, Oak Ridge, Tennessee 37831-6116
D. M. Kroeger
Affiliation:
Oak Ridge National Laboratory, Metals and Ceramics Division, Oak Ridge, Tennessee 37831-6116
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Abstract

The microstructural changes associated with the reduced dependence of critical current density (Jc) versus thickness of thick, epitaxial YBa2Cu3O7–δ (YBCO) films on rolling-assisted biaxially textured substrates (RABiTS) were investigated. Pulsed laser deposited YBCO films varying in thickness from 1.0 to 6.4 ?m on RABiTS with an architecture of Ni–3 at.% W/Y2O3/yttrium-stabilized-zirconia/CeO2/YBCO were prepared for cross-sectional transmission electron microscopy studies. Dramatic improvements in physical properties and microstructural quality were observed resulting from the use of Ni–3 at.% W substrates, which provided a sharper texture over earlier Ni substrates, and replacement of CeO2 with Y2O3 as the seed layer within the buffers. The YBCO films showed exceptional orientation up to 6.4 μm thickness, with no misoriented grains or dead layers observed and only limited reaction between the YBCO and CeO2 cap layer. The high quality of the films was also attributed in part to the formation of a tungsten oxide layer forming at the top of the Ni–3% W substrate, limiting the growth of deleterious NiO into the conductor.

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Articles
Information
Journal of Materials Research , Volume 18 , Issue 7 , July 2003 , pp. 1723 - 1732
Copyright
Copyright © Materials Research Society 2003

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