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Microscopical Study of the Structural Evolution of Sol-Gel Derived Buffer Layers for the Integration of YBCO on Biaxially Textured Nickel

Published online by Cambridge University Press:  10 February 2011

H. Dobberstein ,
R. W. Schwartz ,
P. G. Clem ,
D. L. Carroll  and
R. Czerw
H. Dobberstein
Affiliation:
The Gilbert C. Robinson Department of Ceramic and Materials Engineering, Clemson University, Clemson, SC 29634-0907
R. W. Schwartz
Affiliation:
The Gilbert C. Robinson Department of Ceramic and Materials Engineering, Clemson University, Clemson, SC 29634-0907, [email protected]
P. G. Clem
Affiliation:
Materials and Process Sciences Directorate, Sandia National Laboratories Albuquerque, NM 87185-1405
D. L. Carroll
Affiliation:
Department of Physics and Astronomy, Clemson University, Clemson, SC, 29634-0978
R. Czerw
Affiliation:
Department of Physics and Astronomy, Clemson University, Clemson, SC, 29634-0978
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Abstract

Epitaxial buffer layers of Ho2O3 on biaxially textured nickel were fabricated using a chelate (acetic acid) solution route as an alternative to the 2-methoxyethanol solution approach, which has demonstrated good texturing characteristics. Plan-view SEM studies of the films as a function of heat treatment temperature have shown that the holmium oxide film pyrolyzes into an open structure with a high level of interconnected porosity before densification, without significant film shrinkage in the thickness direction. Consolidation of the film started around 900°C along the backbone of the open structure and sintering to a dense film of uniform small crystallites (∼25 nm) was observed at higher temperature. The as-received nickel tapes displayed significant surface damage with a roughness on the order of 1000 Å. Electron backscattering analysis suggests that only 65% of the nickel grains were aligned along the (100) axis within 5°. Finally, STM studies of the nickel substrate have shown that small nickel oxide crystallites were formed on the surface when the substrate is in contact with air.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 619: Symposium L – Recent Developments in Oxide & Metal Epitaxy – Theory… , 2000 , 209
Copyright
Copyright © Materials Research Society 2000

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References

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