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Synthetic Conditions and Structural Properties of the High-Tc Phase in the Superconducting Bi-Sr-Ca-Cu-(Pb)-O System

  • Masaaki Mizuno
  • Hozumi Endo
  • Jun Tsuchiya
  • Naoto Kijima
  • Akihiko Sumiyama
  • Yasuo Oguri
Conference paper

Abstract

Synthetic conditions, structural and thermal properties of the high-Tc phase (Tc > 100 K) in the Bi-Sr-Ca-Cu-O system have been investigated. Three methods have been found to be effective in increasing the volume fraction of the high-Tc phase in the Bi-Sr-Ca-Cu-0 system: (1)starting from a nominal composition with more Ca and Cu than Bi2Sr2Ca2Cu3O (2) the addition of Pb to Bi-Sr-Ca-Cu-0 system (3) annealing at 870°C under higher oxygen partial pressures than 0.2 atm. Sample with the nominal composition of Bi2Sr2Ca6Cu8Ox fired at 87O°C for 120 hours was found that it consisted of mainly the high-Tc phase. Unit cell dimensions of the high-Tc phase determined by X-ray powder diffraction and transmission electron diffraction measurement are a = 5.40 Å, b = 27.0 Å and c = 36.8 Ä, indicating a pseudotetragonal symmetry. Transmission electron microscopy showed that there were stacking faults in the high-Tc phase. The high-Tc phase and the low-Tc phase (T ~ 80 K) decompose into Bi2Sr2CuOx by annealing under oxygen partial pressure of 0.02 and 0.1 atm at 87O°C. Under higher oxygen partial pressures than 0.2 atm at 870°C, the high-Tc phase was remarkably formed from the possible disproportionation reaction of the low-Tc phase.

Keywords

Oxygen Partial Pressure Nominal Composition Differential Thermal Analysis Curve Disproportionation Reaction High Oxygen Partial Pressure 
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

  • Masaaki Mizuno
    • 1
  • Hozumi Endo
    • 1
  • Jun Tsuchiya
    • 1
  • Naoto Kijima
    • 1
  • Akihiko Sumiyama
    • 1
  • Yasuo Oguri
    • 1
  1. 1.Research CenterMitsubishi Kasei Corporation (Formerly, Mitsubishi Chemical Industries Ltd.)Midori-ku, Yokohama, 227Japan

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