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자료유형
학술저널
저자정보
임준형 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 장석헌 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 김규태 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 이진성 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 윤경민 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 박의철 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 주진호 (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
저널정보
한국초전도학회 Progress in superconductivity Progress in superconductivity 제7권 제2호
발행연도
2006.1
수록면
140 - 144 (5page)

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초록· 키워드

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We fabricated the YBCO films on single crystal $LaAlO_3$ substrates via a metal organic deposition (MOD) process. In the process, $Y_2Ba_1Cu_1O_x$ and $Ba_3Cu_5O_8$ powders were dissolved in trifluoroacetic acid (TFA) followed by calcining and firing heat treatments. To evaluate the effects of the firing temperature on YBCO phase formation and critical properties, the films were fired at $750^{\circ}C,\;775^{\circ}C\;and\;800^{\circ}C$ after calcining at $430^{\cric}C$. Microstructure observation indicated that a crack-free surface formed and a strong biaxial texture was developed. The FWHM of out-of-plane texture was measured to be in the range of $4.3^{\cric}-7.0^{\circ}$ for all the films. When the YBCO film was fired at $775^{\cric}C$, it had the highest critical properties: 88.5 K of critical temperature and 16 A/cm-width of critical current ($1MA/cm^2$ as critical current density). On the other hand, those properties were degraded as firing at $750^{\circ}C\;and\;800^{\circ}C$. It is considered that the improved critical values are partly owing to dense and homogeneous microstructure, strong texture, and high oxygen content.

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