Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Phase transformation of $REBa_2Cu_3O_{7-x}$ (RE=Nd, Gd, Dy) Superconductor during Continuous Cooling and Isothermal Heat Treatment

등온열처리와 냉각에 따른 $REBa_2Cu_3O_{7-x}$ (RE=Nd, Gd, Dy) 초전도체의 상변화

  • 오용택 (조선대학교 에너지자원신기술연구소) ;
  • 신동찬 (조선대학교 신소재공학과) ;
  • 한영희 (한전전력연구원 신에너지그룹) ;
  • 성태현 (한전전력연구원 신에너지그룹) ;
  • 정년호 (한전전력연구원 신에너지그룹)
  • Published : 2003.05.23
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Abstract

The phase transformation of $REBa_2Cu_3O_{7-x}$ (RE=Nd, Gd, Dy) was investigated using isothermal heat-treatment and continuous cooling in air. During continuous cooling, the $REBa_2Cu_3O_{7-x}$ (RE=123) superconducting phase with well-distributed $REBa_2Cu_3O_{7-x}$ (RE-211) was obtainde at a cooling rate of $0.001^{\circ}C$/s. Single phase RE-123 (Nd, Gd, Dy) was stable at $1050^{\circ}C$, $1050^{\circ}C$, and $950^{\circ}C$ during isothermal heat-treatment, respectively. Above these temperatures the RE-211 phase existed within the RE-123 grains. The RE-123, RE-211, $BaCu_2Od_2$, and CuO phases coexisted at $50^{\circ}C$ below the partial melting temperature for each respective rare-earth RE-123.

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