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초전도 세라믹 Y-Ba-Cu-O계의 구조적 상전이와 분해거동에 관한 연구
이민호,이민상,김양수,진영철 ( M . H . Lee,M . S . Lee,Y . S . Kim,Y . C . Jin ) 한국열처리공학회 1991 熱處理工學會誌 Vol.4 No.3
In this study, the structural phase transition and decomposition of superconducting ceramic, Y-Ba-Cu-O system was studied. The results of the study are as follows. The high Tc superconductor Y₂Ba₂Cu₃O_(7-x) is made in solid state reaction of O₂atmosphere and the valve of X in Y₂Ba₂Cu₃O_(7-x) is 0.1∼0.2. The transition temperature of tetragonal-orthorhombic phase of Y₂Ba₂Cu₃O_(7-x) appear at 790℃-900℃. In the result of measuring the electrical resistance of sample annealed in O₂atmosphere, the electrical resistance show zero at 92K and the best superconductor, Y₂Ba₂Cu₃O_(7-x)(Y123) can be mabe.
Bi-Pb-Sr-Ca-Cu-O계 산화물 고온초전도체의 특성에 관한 연구
김양수,이민상,이민호,진영철 ( Y . S . Kim,M . S . Lee,M . S . Lee,Y . C . Jin ) 한국열처리공학회 1991 熱處理工學會誌 Vol.4 No.1
The formation of high T_c phase is very sluggish and c parameter of unit cell of high T_c phase is about 37Å. High T_c oxide superconductor with a T_c above 100K 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 37Å. 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.