Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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A Study on the Characteristic of High Tc Oxide Superconductor, Bi-Pb-Sr-Ca-Cu-O System

Bi-Pb-Sr-Ca-Cu-O계 산화물 고온초전도체의 특성에 관한 연구

  • Kim, Y.S. (Dept. of Metallurgical Eng., Chonbuk National University) ;
  • Lee, M.S. (Eng. Lab., College of Eng., Chonbuk National University) ;
  • Lee, M.S. (Eng. Lab., College of Eng., Chonbuk National University) ;
  • Jin, Y.C. (Dept. of Metallurgical Eng., Chonbuk National University)
  • 김양수 (전북대학교 공과대학 금속공학과) ;
  • 이민상 (전북대학교 공과대학 공동시험소) ;
  • 이민호 (전북대학교 공과대학 공동시험소) ;
  • 진영철 (전북대학교 공과대학 금속공학과)
  • Published : 1991.03.30
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Abstract

The formation of high $T_c$ phase is very sluggish and c parameter of unit cell of high $T_c$ phase is about $37{\AA}$. High $T_c$ oxide superconductor with a $T_c$ above 100 K has been successfully prepared by solid state reaction method in BiSrCaCuO system by Pb adding. The microstructure related to the formation of the high $T_c$ phase has been investigated. As compared with YBCO compound, the formation reaction of the high $T_c$ requires long time heat treatment. It is due to the transformation from the low $T_c$ phase to high $T_c$ phase. The sintering just below the melting point of the calcined powder mixture is effective on the formation of the high $T_c$ phase in Pb-added BiSrCaCuO system. The growth of the high $T_c$ superconducting phase has a thin plate shape, which is characterized by the c parameter of $37{\AA}$. The formation of the high $T_c$ phases is delayed by the excessive addition of Pb. The lattice parameter(c) of the unit cell (both the low and high $T_c$ phases) is increased with increase of Pb.

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