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Deposition of Superconducting Tl-Ba-Ca-Cu-O Phases on Metal Foils by Metal-Organic Chemical Vapor Deposition

Published online by Cambridge University Press:  26 February 2011

D. L. Schulzi ,
B. Hano ,
D. Neumayer ,
B. J. Hinds ,
T. J. Markst ,
D. C. Degroot ,
J. L. Schindler ,
T. Hogan  and
C. R. Kannewurf
D. L. Schulzi
Affiliation:
Department of Chemistry, Northwestern University, Evanston, IL, 60208–3113.
B. Hano
Affiliation:
Department of Chemistry, Northwestern University, Evanston, IL, 60208–3113.
D. Neumayer
Affiliation:
Department of Chemistry, Northwestern University, Evanston, IL, 60208–3113.
B. J. Hinds
Affiliation:
Department of Chemistry, Northwestern University, Evanston, IL, 60208–3113.
T. J. Markst
Affiliation:
Department of Chemistry, Northwestern University, Evanston, IL, 60208–3113.
D. C. Degroot
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL, 60208–3113.
J. L. Schindler
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL, 60208–3113.
T. Hogan
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL, 60208–3113.
C. R. Kannewurf
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL, 60208–3113.
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Abstract

The synthesis of superconducting Tl-Ba-Ca-Cu-O thin films on metal foils (Au and Ag) by metal-organic chemical vapor deposition (MOCVD) has been investigated. Ba-Ca-Cu-O-(F) films are first prepared via MOCVD using fluorinated “second generation” metal-organic precursors. After an intermediate anneal with water vapor-saturated oxygen to promote removal of F, Tl is introduced by annealing in the presence of a mixture of oxides (Tl2O3, BaO, CaO, CuO) of a specific composition. Characterization of the thin films by scanning electron microscopy, EDX, x-ray diffraction, and variable temperature magnetization measurements has been carried out. High temperature superconductor (HTS) films of Tl2Ba2Ca1Cu2O8−x on Au foil exhibit a magnetically derived Tc = 80K and a high degree of texturing with the crystallite c-axes oriented perpendicular to the substrate surface as evidenced by enhanced (000 x-ray diffraction reflections. Thin film coverage on Ag foil becomes non-contiguous during the (Tl2O3, BaO, CaO, CuO) mixture anneal.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 365
Copyright
Copyright © Materials Research Society 1992

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References

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