Journal of Materials Science

, Volume 26, Issue 18, pp 5101–5106 | Cite as

Formation of the high-Tc phase in lead-doped Bi-Sr-Ca-Cu-O superconductors

  • Ki Hyun Yoon
  • Hae Bum Lee


The characteristics of Bi-Sr-Ca-Cu-O superconductors have been investigated as a function of the amount of Pb addition. The volume fraction of the high-Tc phase increases with increasing Pb addition up to x=0.3 in (Bi1−xPbx)2Sr2Ca2Cu3Oy and above that it decreases. The grain size is increased and density is decreased with increasing Pb addition, due to two-dimensional grain growth which results from formation of the high-Tc phase. The specimen with x=0.3 has a transition temperature of 104 K and high magnetic susceptibility due to the fact that most of the volume fraction is of the high-Tc phase. Pb addition cause formation of Ca2PbO4 as a secondary phase and it produces a partially melted liquid phase below the sintering temperature, which acts as a flux and promotes formation of the high-Tc phase.


Polymer Grain Size Liquid Phase Transition Temperature Magnetic Susceptibility 
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Copyright information

© Chapman & Hall 1991

Authors and Affiliations

  • Ki Hyun Yoon
    • 1
  • Hae Bum Lee
    • 1
  1. 1.Department of Ceramic EngineeringYonsei UniversitySeoulKorea

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