한국전기전자재료학회논문지 (Journal of the Korean Institute of Electrical and Electronic Material Engineers)

  • 제19권5호
  • /
  • Pages.467-476
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  • 2006
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  • 1226-7945(pISSN)
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  • 2288-3258(eISSN)
한국전기전자재료학회 (The Korean Institute of Electrical and Electronic Material Engineers)
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TFA-MOD법을 이용한 YBCO 박막의 열처리 온도와 두께의 영향

Effects of the Heat Treatment Temperature and Thickness of YBCO Film Fabricated by TFA-MOD Method

  • 장석헌 (성균관대학교 신소재공학부) ;
  • 임준형 (성균관대학교 신소재공학부) ;
  • 이진성 (성균관대학교 신소재공학부) ;
  • 윤경민 (성균관대학교 신소재공학부) ;
  • 김규태 (성균관대학교 신소재공학부) ;
  • 주진호 (성균관대학교 신소재공학부) ;
  • 김찬중 (한국원자력연구소 원자력재료기술개발부) ;
  • 나완수 (성균관대학교 정보통신공학부)
  • 발행 : 2006.05.01
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초록

We fabricated the YBCO films on LAO substrate using the TFA-MOD method and evaluated the effects of heat treatment temperature and film thickness on the microstructure, degree of texture, and critical properties. The calcining and firing were peformed at the temperature range of $370^{\circ}C-460^{\circ}C\;and\;750^{\circ}C-800^{\circ}C$, respectively. For the films fired at $775^{\circ}C$ after calcining at $400^{\circ}C-430^{\circ}C$showed highest critical temperature (Tc-onset) of 89.5 K and critical current (Ic) of 40A/cm-width which corresponds to critical current density (Jc) of $1.8MA/cm^2$. The highest critical properties are probably attributed to the formation of purer YBCO phase, stronger biaxial texture, and higher oxygen content, according to the XRD, pole-figure, SEM, Raman analysis. From the multi-coated films, the Ic increased from 39 to 169 A/cm-width as the coating repeated to four times, while the corresponding Jc was measured from once to be in the range of $0.8-1.2MA/cm^2$. Both Ic and Jc degraded as the coating repeated further, indicating that the optimum thickness is in the range of $1.0{\mu}m-1.7{\mu}m$.

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