TFA-MOD법으로 제조된 다층 YBCO 박막의 미세구조 관찰

장석헌; 임준형; 이창민; 황수민; 최준혁; 심종현; 주진호; 김찬중

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자료유형: 학술저널

저자정보: 장석헌 (Neutron Science Division, Korea Atomic Energy Research Institute) 임준형 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 이창민 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 황수민 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 최준혁 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 심종현 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 주진호 (School of Advanced Materials Science and Engineering, Sungkyunkwan University) 김찬중 (Neutron Science Division, Korea Atomic Energy Research Institute)

저널정보: 한국초전도학회 Progress in superconductivity Progress in superconductivity 제9권 제2호

발행연도: 2008.1

수록면: 167 - 172 (6page)

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We fabricated $YBa_2Cu_3O_{7-x}$(YBCO) films on (00l) $LaAlO_3$ substrates prepared by metal organic deposition(MOD) method using trifluoroacetate(TFA) solution. The films with various thicknesses were prepared by repeating the dip-coating and calcining processes. The effects of film thickness on phase formation, microstructures, and critical properties were evaluated by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The microstructure and resultant critical current($I_C$) and critical current density($J_C$) varied remarkably with film thickness: The ($I_C$) value increased from 39 to 160 A/cm-width as the number of coatings increased from one to four, while the corresponding $J_C$ was measured to be in the range of $0.84-1.21\;MA/cm^2$. Both the $I_C$ and $J_C$ decreased when an additional coating was applied due to microstructural degradation, indicating that the optimum thickness is in the range of $1.1-1.8\;{\mu}m$. The possible cause for the decrease in the $I_C$ and $J_C$ value for film thicker than $1.8\;{\mu}m$ include non-uniform thickness, increased surface roughness, and the poor formability of the YBCO phase and texture arising from the insufficient heat treatment time with respect to the increased thickness.

#critical current #multi-coating #TFA-MOD process #YBCO coated conductor

참고문헌 (7)

참고문헌 신청

B. zhao / 2003 / Effect of precursor stoichiometry on the superconducting properties of fluorine-free sol-gel YBCO thin films / Physica C 386:348~352

J. H. Lim / 2006 / Fabrication of YBCO film approached by the “211 process” in TFA-MOD method / Supercond. Sci. Technol 19:306~312

T. Honjo / 2003 / Fabrication and growth mechanism of YBCO coated conductors by TFA-MOD process / Physica C :392~396

S. Annavarapu / 2002 / Progress towards a low-cost commercial coated conductor / Mater. Reas. Soci. Symp. 2002-Proc.

M. W. Rupich / 2003 / YBCO coated conductors by an MOD/RABiTS process / IEEE Trans. Appl. Supercond :2458~2461

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