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Preparation and Properties of Pb-Doped Bi-Sr-Ca-Cu-O Superconductors

  • Hiroshi Maeda
  • Hiroaki Kumakura
  • Toshihisa Asano
  • Hisashi Sekine
  • Daniel R. Dietderich
  • Syozo Ikeda
  • Kazumasa Togano
  • Yoshiaki Tanaka
Conference paper

Abstract

Bi-Sr-Ca-Cu-O superconductors with a Pb addition were prepared by a conventional solid state reaction. Early in the sample heat treatment a large volume fraction of low-Tc phase (Bi2Sr2Ca1Cu2Ox) exists. With further sintering the volume fraction of the high-Tc phase (Bi2Sr2Ca2Cu3Ox) gradually increases. A zero resistance transition temperature of 110K was achieved for samples with a nominal composition of Bi0.7Pb0.3Sr1Ca1Cu1.8Ox and a sintering treatment of 845°C for 300 h in air. The critical current density, Jc, of the sample at 77K in zero magnetic field is 210 A/cm2, which is much larger than that of Pb-free sample. A pellet compaction process to densify and align the grains of high-T phase during an interrupted sintering treatment has been shown to be an effective method to increase Jc. A J greater than 1100 A/cm2 can be easily achieved by this process. A new mode of modulation with a wave length of about 50 A is seen in the Pb modified material in addition to the conventional modulation observed in the Pb-free system. Periodicities of the new, as well as, conventional modulation modes become less regular in the Pb-doped system.

Keywords

Nominal Composition Critical Current Density Conventional Solid State Reaction Large Volume Fraction Conventional Modulation 
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 Japan 1989

Authors and Affiliations

  • Hiroshi Maeda
    • 1
  • Hiroaki Kumakura
    • 1
  • Toshihisa Asano
    • 1
  • Hisashi Sekine
    • 1
  • Daniel R. Dietderich
    • 1
  • Syozo Ikeda
    • 1
  • Kazumasa Togano
    • 1
  • Yoshiaki Tanaka
    • 1
  1. 1.Tsukuba LaboratoriesNational Research Institute for MetalsTsukuba, 305Japan

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