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RISS 인기검색어
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- 저자 : 송규정 ( K. J. Song ) (검색결과 4 건)
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$YBa_2CU_3O_{7-\delta}$ coated Conductor 완충층으로의 응용을 위한 $SrTiO_3 $ 박막의 성장 조건
정준기,고락길,송규정,박찬,김철진,Chung, J.K.,Ko, R.K.,Song, K.J.,Park, C.,Kim, C.J. 한국결정학회 2003 韓國結晶學會誌 Vol.14 No.2
YBa₂CU₃O/sub 7-8/(YBCO) coated conductor의 완충층 구조를 개선하기 위하여 2축배향된 Ni-3 wt%W 합금 기판위에 단일 완충층으로 SrTiO₃(STO) 박막을 증착하였다. YBCO와 STO 박막은 펄스레이저 증착법으로 성장시켰다. STO 박막의 표면은 증착온도에 따라 다른 미세조직을 보여 주었고, XRD 분석에서는 STO와 YBCO 박막이 금속기판의 배향성을 가지면서 성장되었음을 알 수 있었다. 액체질소 온도에서 1.2 MA/㎠의 임계전류밀도와 86 K의 임계온도를 가지는 짧은 길이의 coated conductor를 STO 단일완충층을 이용하여 제조하였다. SrTiO₃ (STO) thin fims were deposited on the biaxially textured Ni-3 wt%W alloy substrates to be used as a single buffer layer for YBa₂CU₃O/sub 7-8/(YBCO) coated conductor. Thin films of YBCO and STO were deposited using pulsed laser. The deposition condition for epitaxial growth of STO on the textured metal was identified, and YBCO coated conductor with a single STO buffer layer with critical current density of 1.2 MA㎠ at 77 K under zero magnetic field and critical temperature of 86 K, was fabricated.
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Bi2212/Ag 선재의 초전도 특성에 대한 열처리의 영향
김상철,하동우,송규정,오상수,이남진,한일용,오재근,손호상,Kim, S.C.,Ha, D.W.,Song, K.J.,Oh, S.S.,Lee, N.J.,Han, I.Y.,Oh, J.G.,Sohn, H.S. 한국초전도학회 2006 Progress in superconductivity Vol.8 No.1
We have fabricated double stacked 385 filamentary Bi2212/Ag round wires which have different Ag ratios. The wires have been heat-treated at the maximum temperature($T_{max}$) of $882{\sim}896^{\circ}C$ for 0.5 h. Effect of heat treatment on critical current density and critical temperature on Bi2212/Ag round wires has been studied. Critical current density of the wire heat -treated at $890^{\circ}C$ showed 206,250 $A/cm^2$ at 4.2 K, 0 T and critical temperature of the wire was 83 K. Microstructure of the wires also has been studied via optical microscopy and SEM.
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RF Magnetron Sputter를 이용한 TiO2 박막 제조 연구
임지천 ( J. C. Lim ),송규정 ( K. J. Song ) 전북대학교 과학교육연구소 2011 과학과 과학교육 논문지 Vol.36 No.-
RF magnetron reactive sputter 방법으로 p-type Si-wafer (100) 기판에 고순도(반경 3 inch) Ti target을이용하여 TiO2 박막들을 제조하였다. Target과 기판간의 거리는 6 cm로 고정하고, 기판온도(Ts)는 100∼500℃, 증착시간은 0.5∼1.5시간, 그리고 RF power는 100∼250W 범위 내에서 조절하여 TiO2 박막을 성장하였다. 각 조건별로 증착한 박막의 결정성을 XRD를 통해 분석하였으며, 표면 이미지와 증착 두께들은 SEM을 통해 분석하였다. RF Magnetron Reactive Sputter 방법을 이용한 TiO2 박막성장 이외에, 차별화된 방법으로 먼저 Ti 박막 층을 먼저 성장 시킨 후, O2 분위기에서 열처리 과정을 통한 TiO2 박막 성장을 시도 하였으며, 이들 두 방법들에 대한 결과들을 비교 분석하였다.을 분석하였다. TiO2 thin films were deposited on p-type Si-wafer (100) substrates, from pure Ti target with a diameter of 3 inches, employing by a conventional RF magnetron reactive sputter system. For the fixed target-to-substrate distance (6cm), films were deposited with several deposition conditions. Substrate temperature(Ts) was varied from 100 to 500℃. The sputtering was performed at RF powers in the range of 100∼250W for the deposition time of 0.5∼1.5 hours. The crystalline structure of the film was observed by XRD patterns for all films deposited with unique parameters. Both the surface image and the thickness of films were investigated by SEM. In addition, TiO2 thin films were grown by an another way which is two-step process. After depositing Ti thin layer on the substrate, it was annealed at several temperatures, with flowing a mixed gas(Ar+O2). The comparative study of both results for TiO2 thin films, which were grown by RF magnetron reactive sputter and two-step process, was carried out.
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하홍수,김호겸,고락길,김호섭,송규정,박찬,유상임,주진호,문승현,Ha H. S,Kim H. K,Ko R. K,Kim H. S,Song K. J,Park C,Yoo S. I,Joo J. H,Moon S. H 한국초전도학회 2004 Progress in superconductivity Vol.6 No.1
Ni alloy tape is electropolished to be used as a metal substrate for fabrication of IBAD (ion-Beam Assisted Deposition)-MgO texture template fur HTS coated conductor. Electropolishing is needed to obtain a very smooth surface of Ni alloy tape because the in-plane texture of templates is sensitive to the roughness of metal substrate. The critical current of YBCO coated conductor depends on the texture of YBCO that depends on the texture of the IBAD MgO layer. And so the smoothness of the metal substrate is directly related to the superconducting properties of the coated conductor. In this study, we have prepared a reel-to-reel electropolishing apparatus to polish the Ni alloy tapes for IBAD. Various electropolishing conditions were investigated to improve the surface roughness. Hastelloy tape is continuously electropolished with high polishing current density (0.5 ∼ 2 A/$\textrm{cm}^2$) and fast processing time (1 ∼ 3 min). Polished hastelloy tapes have surface roughness(RMS) of below 1 nm on a 5 ${\times}$ 5 $\mu\m^2$ from AFM and SEM.
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