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MOD-TFA 공정에 의한 YBCO박막제조시 과잉 yttrium첨가 효과에 관한 연구
이승이,송슬아,김병주,박진아,김호진,이희균,홍계원,장석헌,주진호,유재무,Lee Seung-Yi,Song Seul-A,Kim Byeong-Joo,Park Jin-A,Kim Ho-Jin,Lee Hee-Gyoun,Hong Gye-Won,Jang Seog Heon,Joo Jinho,Yoo Jai-Moo,Pradeep Halder 한국초전도학회 2005 Progress in superconductivity Vol.7 No.1
[ $YBa_{2}Cu_{3}O_{7-x}$ ] thin films were fabricated on $LaAlO_3$(100) substrate by TFA-MOD process. Yttrium-excess (0, 2.5, 5, 10, 15, 20 $at\%$) coating solution was prepared by adding extra amount of yttrium into a stoichiometric(Y:Ba:Cu=1:2:3) TFA precursor solution. Results are presented concerning the influence of excess yttrium additions on the microstructure development and superconducting properties of $YBa_{2}Cu_{3}O_{7-x}$ film. Large sized CuO particles was observed by SEM EDS investigation. The addition of excess yttrium affected little on $T_c$ of $YBa_{2}Cu_{3}O_{7-x}$ film. $J_c$ of YBCO film was enhanced with excess yttrium addition. Jc maximum of $2.21\;MA/cm^2$ (77 K, self field) appeared with the $15\;at\%$ addition of excess yttrium. With further yttrium addition up to $20\;at\%$, Jc decreased down to $0.9\;MA/cm^2$.
Precipitation Process 에 의한 Stibnite 부선정광의 제연시험
이승이 대한금속재료학회(대한금속학회) 1968 대한금속·재료학회지 Vol.6 No.3
The aim of these experiments is to get a high recovery of antimony from precipitation process with Choong Nam district Stibnite. This experiment is done in the electric furnace concerned operation temperature, recovery, rate of mixture with Stibnite flotation concentrates, added iron scrap, Na₂CO₃, and Na₂SO₄. As a result of this experiment, antimony can be obtained with high recovery at 870℃∼900℃ by adding Na₂CO₃30% and Na₂SO₄25%.