Structure and Superconducting Properties of Bi-2212 Cylinders Prepared by Diffusion Process

  • Y. Yamada
  • F. Yamashita
  • K. Wada
  • K. Tachikawa
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 44)

Abstract

Bi-2212 oxide superconductors have been synthesized by the diffusion reaction between Sr-Ca-Cu oxide substrate and Bi-Cu oxide coating layer. The substrate with Sr:Ca:Cu atomic ratio of 2:1:2 is pressed into a cylindrical rod or tube by CIP, and then sintered. The coating layer with Bi:Cu ratio of 2:1 and Ag20 addition is coated around the surface of the substrate. The Bi-2212 diffusion phase shows high density and oriented structure with plate-like grains. The transport Ic and Je of the diffusion layer, about 150 µm in thickness, exceed 300 A and 2 × 10 4 A/cm2 at 4.2 K, respectively. The transport Jc decreases with temperature, and is about 1 × 10 4 A/cm2 at 30 K under 1 T. Post annealing in inert gas atmosphere such as Ar and N2 improves Tc of the specimen. The overall resistivity of bulk ends of the specimen is in the order of 10−8 Ω.cm2 at 4.2 K, and shows an ohmic relationship up to Ic. Bulk Bi-2212 oxide cylinders prepared by the present process with large transport Ic and Jc as well as low contact resistivity seem to be promising as a current lead for superconducting magnets.

Keywords

Contact Resistance Diffusion Reaction Post Annealing Bulk High Temperature Superconductor Etching Reagent 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    K. Tachikawa, T. Watanabe, T. Inoue, and K. Shirasu, Bi-Sr-Ca-Cu-O superconducting oxides synthesized from different diffusion couples, Jpn. J. Appl. Phys., 30: 639 (1991).ADSCrossRefGoogle Scholar
  2. 2.
    K. Tachikawa, Y. Yamada, M. Satoh and Y. Hishinuma, Structure and superconducting properties of oriented Bi-2212 oxide layer synthesized by a diffusion process, “ Proc. 1994 Topical International Cryogenic Materials Conference, ” K.Tachikawa, K.Kitazawa, H.Maeda and T.Matsushita, eds., World Scientific (1995), p. 307.Google Scholar
  3. 3.
    T. Hasebe, T. Tsuboi, K. Jikihara, S. Yasuhara, M. Ishihara and Y. Yamada. Critical current measurement unit utilizing Bi-based oxide superconducting current leads and crvocoolers, IEEE Trans. Appl. Superconductivity, 5: 821 (1995).CrossRefGoogle Scholar
  4. 4.
    M. Onoda, A. Yamamoto, E. Takayama-Muromachi and S. Takekawa, Assignment of the powder X-ray diffraction pattern of superconductor Bi2(Sr,Ca)3_xCu20,. _ Jpn. J. Appl. Phys.. 27: 833 (1988).Google Scholar
  5. 5.
    T. Todate, M. Matsukawa, K. Noto, Y. Yamada, K. Jikihara and M. Ishihara, Thermal Conductivity of STYCAST Reinforced Bi-2223 Superconducting Materials. Cryogenic Engineering, 30: 495 (1995) in Japanese.CrossRefGoogle Scholar
  6. 6.
    E. Preisler, J. Bayersdörfer, M. Brunner, J. Bock and S. Elschner, Electrical contacts on bismuth-based bulk high temperature superconductors in high-current applications. Supercond. Sei. & Technol., 7: 389 (1994).ADSCrossRefGoogle Scholar
  7. 7.
    K. Watanabe, S. Awaji, T. Fukase, Y. Yamada, J. Sakuraba, F. Hata, C. K. Chong, T. Hasebe and M. Ishihara, Liquid helium-free superconducting magnets and their applications. Cryogenics, 34: 639 (1994).ADSCrossRefGoogle Scholar
  8. 8.
    D. Ponnusamy, Y. Coulter, M. Daugherty, K. Ravi-Chandar and K. Salama, Processing of BSCCO superconducting rods for current leads, Applied Superconductivity, 4: 247 (1996).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • Y. Yamada
    • 1
  • F. Yamashita
    • 1
  • K. Wada
    • 1
  • K. Tachikawa
    • 1
  1. 1.Tokai UniversityHiratsuka, KanagawaJapan

Personalised recommendations