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Development of a Scalable Tl-1223 Tape Process — Thallination of Powder Precursor Coatings

  • J. E. Tkaczyk
  • K. W. Lay
  • D. Schulz
  • P. A. Parilla
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)

Abstract

Superconducting tapes, 10–20 cm long, of TlBa2Ca2Cu3O9 on Ag have been fabricated by deposition of a thallium-free powder precursor on Ag followed by reaction with a thallium oxide vapor species. Single-sided and two-sided coatings are prepared using a spray-deposition or dip-coating, respectively. The coated tapes are annealed and then mechanically processed to density the precursor. Continuous thallination of precursor tapes is performed by pulling the coated tape through a two-zone furnace at constant velocity and gave similar results as batch processing. Critical currents of the order 10–20 A at 77K, zero field for a 5 mm wide tape are observed. Properties as a function of magnetic field indicate reduced flux creep compared to the more anisotropic bismuth cuprate superconductors and make thallium 1223 an attractive material for conductor applications at high temperatures.

Keywords

Critical Current Critical Current Density Spray Pyrolysis Precursor Powder Silver Foil 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    J. A. DeLuca, P.L. Karas, J.E. Tkaczyk, P.J. Bednarczyk, M.F. Garbauskas, CL. Briant, and D.B. Sorensen, “The preparation of “1223” Tl-Ca-Ba-Cu-oxide superconducting films via the reaction of silver-containing spray deposited Ca-Ba-Cu-oxide with thallium oxide vapor”, Physica C 205:21 (1993);CrossRefGoogle Scholar
  2. 1a.
    J.E. Tkaczyk, J.A. DeLuca, P.L. Karas, P.J. Bednarczyk, M.F. Garbauskas, R.H. Arendt, K.W. Lay, J.S. Moodera, “Transport critical currents in spray pyrolyzed films of TlBa2Ca2Cu3Oz on polycrystalline zirconia substrates”, Appl. Phys. Lett. 61:610 (1992).CrossRefGoogle Scholar
  3. 2.
    T.J. Doi, T.Yuasa, T. Ozawa, and K. Higashiyama, “Transport Critical Current Densities in Uniaxially and Biaxially Oriented Tl1(Ba0.8Sr0.2)2Ca2Cu3O9 superconducting films on Ag and SrTiO3 Substrates Prepared by a Spray Pyrolysis Method”, Jpn. J. Appl. Phys. 33:5692 (1994).CrossRefGoogle Scholar
  4. 3.
    P.A. Parilla, D.L. Schulz, R. Bhattacharga, R.D. Blaugher, D.S. Ginley, J.A. Voigt, E.P. Roth, and E.L. Venturini, “Thermal Processing of Spray-Pyrolyzed and Electrodeposited Tl Superconductor Films and Optimization of the Transport Critical Current Density”, IEEE Trans. on Applied Superconduct. 5:1958 (1995).CrossRefGoogle Scholar
  5. 4.
    A. Mogro-Campero, P.J. Bednarczyk, J.E. Tkaczyk, and J.A. DeLuca, “Critical Current as a function of film thickness for spray pyrolysis films of TlBa2Ca2Cu3Oy”, Physica C 247:239 (1995).CrossRefGoogle Scholar
  6. 5.
    D.L. Schulz, P.A. Parilla, D.S. Ginley, A. Voigt, and E.P. Roth, “Thick C-Axis Textured (Tl,Pb)(Ba,Sr)2Ca2Cu3O9/Ag0.37 Superconducting Tapes by an Ink Spray Pyrolysis Method Using a Tl-free Precursor,” Appl. Phys. Lett. 65:2472 (1994)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • J. E. Tkaczyk
    • 1
  • K. W. Lay
    • 1
  • D. Schulz
    • 2
  • P. A. Parilla
    • 2
  1. 1.GE Corporate Research & DevelopmentSchenectadyUSA
  2. 2.National Renewable Energy LaboratoryGoldenUSA

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