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http://dx.doi.org/10.4313/JKEM.2006.19.5.467

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

Jang Seok-Hern (성균관대학교 신소재공학부)
Lim Jun-Hyung (성균관대학교 신소재공학부)
Lee Jin-Sung (성균관대학교 신소재공학부)
Yoon Kyung-Min (성균관대학교 신소재공학부)
Kim Kyu-Tae (성균관대학교 신소재공학부)
Joo Jin-Ho (성균관대학교 신소재공학부)
Kim Chan-Joong (한국원자력연구소 원자력재료기술개발부)
Nah Wan-Soo (성균관대학교 정보통신공학부)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.19, no.5, 2006 , pp. 467-476 More about this Journal
Abstract
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 $1.0{\mu}m-1.7{\mu}m$.
Keywords
Critical current; Multi-coating; Pole-figure; TFA-MOD process; YBCO coated conductor;
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Times Cited By KSCI : 1  (Citation Analysis)
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