Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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The Formation and Transition of 2212 and 2223 Phase in BPSCCO System

BPSCCO System에서 2212 및 2223 phase의 생성.전이

  • Park, Y.P. (Dept. of Elec. Eng. Grad., Kwangwoon Univ.) ;
  • Wang, J.B. (Dept. of Elec. Eng. Grad., Kwangwoon Univ.) ;
  • Kim, H.C. (Dept. of Elec. Eng. Myunggi Coll.) ;
  • Kim, W.G. (Dept. of Elec. Eng. Seoul Indus. Coll.) ;
  • Lee, J.U. (Dept. of Elec. Eng. Kwangwoon Univ.)
  • 박용필 (광운대학교 대학원 전기공학과) ;
  • 왕종배 (광운대학교 대학원 전기공학과) ;
  • 김홍철 (명지실업전문대학 전기과) ;
  • 김왕곤 (서울산업대학 전기공학과) ;
  • 이준웅 (광운대학교 전기공학과)
  • Published : 1991.11.22
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Abstract

The formation and transition of 2212 and 2223 phase have been studied in BPSCCO system. The 2212 phase formed in early sintering state reacts on $Ca_2PbO_4,\;Ca_2CuO_3$ and CuO during sintering process and thus produces the 2223 phase. A long sintering period is need to fabricate the superconductor with large volume fraction of 2223 phase. Also, the thin plate-like grains composed of Bi, Sr, Ca and Cu contribute to 2223 phase formation. Though the sample has lower volume fraction of 2223 phase, the critical temperature is measured highly in case of the grain grown to plate-like shape. In this work, the critical temperature of the sample sintered for 264 hr in air was measured 108 K. Microstructure of the sample was varied with condition of heat treatment after sintering process and the sample annealed with $500^{\circ}C$ for 5 hr showed excellent charateristics of 2223 phase formation.

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