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Effects of Conversion Parameters on the Transport Properties of YBCO Films in the BaF2 Ex Situ Process

Published online by Cambridge University Press:  03 March 2011

J. Yoo*
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
K.J. Leonard
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
D.F. Lee
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
H.S. Hsu
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
L. Heatherly
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
F.A. List
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
N.A. Rutter
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
A. Goyal
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
M. Paranthaman
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
D.M. Kroeger
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
*
a)Address all correspondence to this author. e-mail: yooj@ornl.gov
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Abstract

The effects of conversion parameters on transport properties of YBa2Cu3O7-δ (YBCO) films on rolling assisted biaxially textured substrates (RABiTS) in the BaF2 ex situ process were investigated for total pressures Ptotal between 0.1 and 1.3 atm, water vapor pressures PH2O between approximately 7 and 70 Torr and processing temperatures TS between 700 and 790 °C. For this study, a 0.3-μm-thick Y–BaF2–Cu–O precursor film was deposited on a 1-cm-wide Ni=3 at.% W RABiTS with a buffer layer architecture of CeO2/YSZ/Y2O3/Ni deposited in single passes in various reel-to-reel systems for each layer. Under the conditions of Ptotal = 0.1 atm, TS = 740 °C and PO2 approximately 150 mTorr, JC > 2 MA/cm2 was obtained at 77 K and self field for PH2O ≤ 20 Torr. At higher PH2O (=70 Torr), however, the maximum attainable JC decreased. In addition, the JC at these higher PH2O dropped rapidly with increased dwell time. The highest JC, 2.5 MA/cm2, was achieved at 730 °C with Ptotal = 0.1 atm and PH2O approximately 7 Torr. Finally, the variation of IC with wet conversion time was performed at each processing temperature.

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Articles
Copyright
Copyright © Materials Research Society 2004

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References

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