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Microstructure and AC-Susceptibility of (Y,Ca)Ba2Cu4O8 Superconductors Prepared at Low (3 atm) and High (400 atm) Oxygen Pressure

  • Nobuo Suzuki
  • Takahiro Wada
  • Ataru Ichinose
  • Yuji Yaegashi
  • H. Yamauchi
Conference paper

Abstract

Superconductive (Y1−xCax)Ba2Cu4O8 (x=0.0 and 0.05) ceramics were successfully prepared by firing for 160 h at 850 °C and at an oxygen partial pressure of 3 atm without using any catalysts. These samples were characterized by x-ray powder diffraction, scanning electron microscope (SEM) and electrical resistivity and ac magnetic susceptibility measurements. The x-ray powder diffraction pattern changed little after post-annealing for 6 h at 1070 °C and at oxygen partial pressure of 400 atm. The grains in the sample prepared at P(O2)=3 atm were small and poorly sintered, while grains in the post-annealed sample at P(O2)=400 atm were large and well sintered to be rectangular shaped. The temperature dependence of both the real and imaginary components, x ′, and x ″, of the ac susceptibility was measured. The width of x ′ at the superconducting transition temperature for the post-annealed samples was narrower than that for as-sintered samples.

Keywords

Electrical Resistivity Oxygen Partial Pressure Superconducting Transition Temperature Imaginary Component Cold Isostatic Pressing 
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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Copyright information

© Springer-Verlag Tokyo 1991

Authors and Affiliations

  • Nobuo Suzuki
    • 1
  • Takahiro Wada
    • 1
  • Ataru Ichinose
    • 1
  • Yuji Yaegashi
    • 1
  • H. Yamauchi
    • 1
  1. 1.Superconductivity Research LaboratoryInternational Superconductivity Technology CenterKoto-ku, Tokyo, 135Japan

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