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Partial melt processing of solid-solution Bi2Sr2CaCu2O8+δ thick-film conductors with nanophase Al2O3 additions

Published online by Cambridge University Press:  31 January 2011

T. Haugan ,
W. Wong-Ng ,
L. P. Cook ,
M. D. Vaudin ,
L. Swartzendruber  and
P. N. Barnes
T. Haugan*
Affiliation:
National Institute of Standards and Technology, Materials Science and Engineering Laboratory, 100 Bureau Dr. Stop 8520, Gaithersburg, Maryland 20899-8520
W. Wong-Ng
Affiliation:
National Institute of Standards and Technology, Materials Science and Engineering Laboratory, 100 Bureau Dr. Stop 8520, Gaithersburg, Maryland 20899-8520
L. P. Cook
Affiliation:
National Institute of Standards and Technology, Materials Science and Engineering Laboratory, 100 Bureau Dr. Stop 8520, Gaithersburg, Maryland 20899-8520
M. D. Vaudin
Affiliation:
National Institute of Standards and Technology, Materials Science and Engineering Laboratory, 100 Bureau Dr. Stop 8520, Gaithersburg, Maryland 20899-8520
L. Swartzendruber
Affiliation:
National Institute of Standards and Technology, Materials Science and Engineering Laboratory, 100 Bureau Dr. Stop 8520, Gaithersburg, Maryland 20899-8520
P. N. Barnes
Affiliation:
Air Force Research Laboratory, Propulsion Directorate, 2645 Fifth St., Ste. 13, Wright-Patterson AFB, Ohio 45433-7919
*
a)Address all correspondence to this author. e-mail: timothy.haugan@wpafb.af.mil
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Abstract

Partial-melt processing of Bi2+xSr2-x-yCa1+yCu2O8+δ (Bi-2212) thick-film conductors with additions of nanophase Al2O3 was studied for dual purposes of increasing flux pinning and inhibiting Sr—Ca—Cu—O phase defect formation. Nanophase Al2O3 (<50% mole fraction) was added to Bi:Sr:Ca:Cu:O powders with four different compositions: three with Bi:Cu approximately 2:2 and one (Bi2Sr2.38Ca1.15Cu2.92O9.7+δ) closer to the ideal Bi-2223 composition. The effect of Al2O3 addition on film microstructural and superconducting properties was studied for a range of partial-melt temperatures (865 to 900 °C). Results were compared to Al2O3-free films with compositions lying within the single-phase solid-solution 2212 region. Nanophase Al2O3 reacted with 2212-type precursors to form a composite of micron size or smaller particles of solid-solution (Sr,Ca)3Al2O6 in a solid-solution 2212 superconducting matrix. The Ca content of the (Sr,Ca)3Al2O6 particles formed approximated that of the 2212 precursor (≤6% mole fraction difference). Addition of 6–25% volume fraction of (Sr,Ca)3Al2O6 to Bi-2212 (by reaction between Al2O3 and Bi-2212) only slightly reduced superconducting transition temperatures and c-axis texturing; however this addition improved film quality by reducing Sr—Ca—Cu—O defect volume fraction by factors of 2 to 6 and significantly increased the critical current density by over one order of magnitude for 0 to 2 T applied fields at 20 to 30 K.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 5 , May 2003 , pp. 1054 - 1066
Copyright
Copyright © Materials Research Society 2003

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