Properties of Pb-Stabilized Bi-Oxide Superconductors

  • N. Murayama
  • E. Sudo
  • Y. Torii
Conference paper


The initial magnetization curve of B1.5Pb0.5Sr2Ca2Cu3Ox superconductor with the Tc of 105 K was measured. The lower critical field, Hcl, was 6 Oe at 77 K, which was much smaller than that of YBa2Cu3O7-y (52 Oe). The volume fraction of the 105 K phase was estimated to be about 80 %.

Grinding the powder in an attrition mill resulted in a slight increase in Tc, although the densification of the sintered body did not ocurr. By hot-pressing at a pressure of 39 MPa at 800 °C in vacuum of 5 x 10-5 Torr for 2 h, the bulk density of the hot-pressed sample reached 6.21 g/cm3 , which was higher than 95 % of the theoretical density, and the Tc was 72 K. The grains were oriented with the c-axis along the pressing axis. After annealing at 835 °C in air for 40 h, the Tc was improved to be 108 K and the critical current density at 77 K was found to be 731 A/cm2.


Bulk Density Critical Current Density Theoretical Density Pressing Axis Sintered Body 
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Copyright information

© Springer Japan 1989

Authors and Affiliations

  • N. Murayama
    • 1
  • E. Sudo
    • 2
  • Y. Torii
    • 1
  1. 1.Government Industrial Research Institute, NagoyaKita-ku, Nagoya, 462Japan
  2. 2.Tokyo Kokyu Rozai Co. Ltd.Asamuta, Ohmuta, 836Japan

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