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자료유형
학술저널
저자정보
김병주 (Department of Advanced Materials Engineering, Korea Polytechnic University) 김혜진 (Department of Advanced Materials Engineering, Korea Polytechnic University) 이금영 (Department of Advanced Materials Engineering, Korea Polytechnic University) 이종범 (Department of Advanced Materials Engineering, Korea Polytechnic University) 김호진 (FCB Development team, SAMSUNG ELECTRO-MECHANICS CO.,LTD) 이희균 (Department of Advanced Materials Engineering, Korea Polytechnic University) 홍계원 (Department of Advanced Materials Engineering, Korea Polytechnic University)
저널정보
한국초전도학회 Progress in superconductivity Progress in superconductivity 제8권 제1호
발행연도
2006.1
수록면
59 - 64 (6page)

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초록· 키워드

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High $J_c\;YBa_2Cu_3O_x$ superconducting films were fabricated by MOD method using fluorine-free dichloroacetic acid(DCA) as chelating solvent for preparing precursor solution. Coating solutions were prepared by dissolving Y-, Ba- and Cu-acetates in DCA solvent followed by drying in rota vapor to obtain the blue gel that is diluted in methanol and 2-methoxyethanol for adjusting the cation concentration. DCA-MOD precursor solution was coated on a single crystal(001) $LaAlO_3(LAO)$ substrate by a dip coating method with a speed of 25 mm/min. Coated films were calcined at lower temperature up to $500^{\circ}C$ in flowing oxygen atmosphere with a 7.2% humidity. Conversion heat treatment was performed at various temperatures of $780{\sim}810^{\circ}C$ for 2 h in flowing Ar gas containing 1000 ppm oxygen with a humidity of 9.45%. SEM observations showed that films have very dense microstructures for the films prepared at the temperature higher than $800^{\circ}C$ regardless of diluting solvent; methanol or 2-methoxyethanol. X-ray diffraction analysis showed that YBCO grains grew with a (001) preferred orientation. A High critical current density($J_c$) of 1.28 $MA/cm^2$(@77 K and self-field) was obtained id. the YBCO film prepared using 2-methoxyethanol as a solvent.

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