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  1. No Access

    Chapter

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

    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...

    J. E. Tkaczyk, K. W. Lay, D. Schulz… in Advances in Cryogenic Engineering Material… (1997)

  2. No Access

    Article

    Texture and transport in spray pyrolyzed TlBa2Ca2Cu3O9 thick films

    The electron backscattering pattern technique has been applied to the microstructural investigation of Tl(1223) thick films formed by vapor-phase thallination of Ag-containing Ba–Ca–Cu–oxide precursors. For sa...

    J. E. Tkaczyk, J. A. Sutliff, J. A. DeLuca… in Journal of Materials Research (1995)

  3. No Access

    Article

    Dependence of critical current density on microstructure and processing of high-Tc superconductors

    Microstructural origins for reduced weak-link behavior in high-Jc melt-processed YBCO, spray pyrolyzed thick films of Tl-1223, metallic precursor Y-124 polycrystalline powder-in-tube (PIT) wires and PIT Bi-2212/2...

    A. Goyal, E. D. Specht, Z. L. Wang, D. M. Kroeger… in Journal of Electronic Materials (1994)

  4. No Access

    Article

    Effect of internal fission-fragment irradiation on critical currents and flux creep in Bi–Sr–Ca–Cu–O superconductors doped with UO2

    Fission fragment damage was introduced into samples of Bi2Sr2CaCu2Ox and Bi1.7Pb0.3Sr2Ca2Cu3Oy, doped with various levels of UO2, by irradiation with thermal neutrons. The critical temperatures were unchanged. Co...

    F. E. Luborsky, R. H. Arendt, R. L. Fleischer… in Journal of Materials Research (1993)

  5. No Access

    Chapter and Conference Paper

    Field Dependence of the Transport Critical Current in Polycrystalline TlBa2Ca2Cu3Oz Films

    Large critical currents with a relatively weak magnetic field dependence are obtained in thick films of TlBa2Ca2Cu3Oz. Transport measurements indicate Jc > 105 A/cm2 at 77K, zero field, and Jc>104 at 60K in a 2T ...

    J. E. Tkaczyk, J. A. DeLuca, P. L. Karas… in Advances in Superconductivity V (1993)

  6. No Access

    Article

    The Synthesis of "1223" TL-CA-BA-CU-Oxide Superconducting Films Via the Reaction of Silver-Containing Spray Deposited Oxide Precursors with Thallium Oxide Vapor in a Two-Zone Reactor

    Superconducting films of "1223" Tlx Ca2Ba2Cu3Oy (0.65<×<l.00) have been prepared on polycrystalline yttria stabilized zirconia substrates via the reaction of thallium oxide vapor with spray-deposited Ca-Ba-Cu-oxi...

    J. A. DeLuca, P. L. Karas, J. E. Tkaczyk, C. L. Briant… in MRS Online Proceedings Library (1992)

  7. No Access

    Article

    Artificial in-plane ordering of textured YBa2Cu3O7−x films deposited on polycrystalline yttria-stabilized zirconia substrates

    Anisotropie surface texturing of the polycrystalline yttria-stabilized zirconia substrates, prior to YBa2Cu3O7−x film deposition, is shown to promote in-plane (basal plane) ordering of the film growth in additio...

    K. S. Harshavardhan, M. Rajeswari, D. M. Hwang, C. Y. Chen… in Journal of Superconductivity (1992)

  8. No Access

    Article

    Critical current and microstructure of uniaxially aligned, polycrystalline YBa2Cu3O7−δ

    Three processing routes that generate uniaxial alignment but otherwise yield very different microstructure and critical current are compared. Fine grain size and c-axis alignment are obtained in magnetically a...

    J. E. Tkaczyk, C. L. Briant, J. A. DeLuca, E. L. Hall… in Journal of Materials Research (1992)

  9. No Access

    Article

    Critical currents after thermal neutron irradiation of uranium doped superconductors

    Fission fragment damage was introduced into aligned sintered samples of various superconductors containing small additions of UO2 by irradiation with thermal neutrons. Samples of aligned, sintered YBa2Cu3Ox, powd...

    F. E. Luborsky, R. H. Arendt, R. L. Fleischer… in Journal of Materials Research (1991)

  10. No Access

    Article

    Effect of grain alignment and processing temperature on critical currents in YBa2Cu3O7-δ sintered compacts

    Magnetically aligned YBa2Cu3O7-δ ceramics show resistivities approaching that of single crystals and improved transport critical currents in a magnetic field. Reduced microcracking and increased transport along t...

    J. E. Tkaczyk, K. W. Lay in Journal of Materials Research (1990)

  11. No Access

    Chapter

    YBa2Cu3O7−x Thin Film Growth on Single Crystal and Polycrystalline Yttria-Stabilized Zirconia

    A variety of single crystal substrate materials have proven useful in obtaining high-quality epitaxial YBa2Cu3O7−x (Y-123) thin films using several different growth techniques.1–5 We have recently grown Y-123 thi...

    David P. Norton, Douglas H. Lowndes… in Science and Technology of Thin Film Superc… (1990)

  12. No Access

    Chapter

    Anisotropic Critical Currents in Aligned Sintered Compacts of YBa2Cu3O7−δ

    Measurements of the critical current anisotropy in grain aligned YBa2Cu3O7−δ ceramics are presented. The low zero-field critical current Jc~102–103 A/cm2 and the sensitivity of Jc to weak magnetic fields indicate...

    J. E. Tkaczyk, K. W. Lay, H. R. Hart in Superconductivity and Applications (1989)

  13. No Access

    Chapter

    Critical Field Measurements on Very thin Films of V-Ga Superconductors

    V3Ga thin films, 500, 20, 10 and 8 nm thick have been made for the purpose of studying the role of spin-orbit scattering in the theory of high field superconductivity. Either 1 percent do**s or thin layers of ....

    J. E. Tkaczyk, P. M. Tedrow in Advances in Cryogenic Engineering Materials (1986)