Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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A Study on the Structural Phase Transition and Decomposition Behavior of the Superconducting Ceramic Y-Ba-Cu-O System

초전도 세라믹 Y-Ba-Cu-O계의 구조적 상전이와 분해거동에 관한 연구

  • Lee, M.H. (Eng. Lab., College of Eng., Chonbuk National University) ;
  • Lee, M.S. (Eng. Lab., College of Eng., Chonbuk National University) ;
  • Kim, Y.S. (Dept. of Metallurgical Eng., Chonbuk National University) ;
  • Jin, Y.C. (Dept. of Metallurgical Eng., Chonbuk National University)
  • 이민호 (전북대학교 공과대학 공동시험소) ;
  • 이민상 (전북대학교 공과대학 공동시험소) ;
  • 김양수 (전북대학교 공과대학 금속공학과) ;
  • 진영철 (전북대학교 공과대학 금속공학과)
  • Published : 1991.09.30
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Abstract

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 $Y_2Ba_2Cu_3O_{7-x}$ is made in solid state reaction of $O_2$ atmosphere and the valve of X in $Y_2Ba_2Cu_3O_{7-x}$ is 0.1~0.2. The transition temperature of tetragonal-orthorhombic phase of $Y_2Ba_2Cu_3O_{7-x}$ appear at $790^{\circ}C-900^{\circ}C$. In the result of measuring the electrical resistance of sample annealed in $O_2$ atmosphere, the electrical resistance show zero at 92 K and the best superconductor, $Y_2Ba_2Cu_3O_{7-x}$(Y 123) can be mabe.

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