서지주요정보
재결정화된 접합형태의 금속기판 위에서 완충막 및 YBCO 고온초전도 박막 형성과 sputtering 조건 그리고 초전도 입계에서의 특성 연구 = Study on sputtering conditions, film growths, and superconducting properties of YBCO films,their grain boundaries and their buffer layers on recrystallized and bonded metallic substrates
서명 / 저자 재결정화된 접합형태의 금속기판 위에서 완충막 및 YBCO 고온초전도 박막 형성과 sputtering 조건 그리고 초전도 입계에서의 특성 연구 = Study on sputtering conditions, film growths, and superconducting properties of YBCO films,their grain boundaries and their buffer layers on recrystallized and bonded metallic substrates / 김호섭.
저자명 김호섭 ; Kim, Ho-Sup
발행사항 [대전 : 한국과학기술원, 2003].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8014244

소장위치/청구기호

학술문화관(문화관) 보존서고

DPH 03010

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Ni tapes were textured by taking advantage of their secondary recrystallization. Ni tapes were composed of very large grains. Their [001] axes were tilted with respect to the surface and their [010] axes were parallel to the rolling direction. The Ni tapes were very tender. But the Ni tapes could be stiffened by adding impurities by the process of atomic diffusion. $YBCO/CeO_2/YSZ/CeO_2$ films were grown on the Ni tapes. if the thickness of the top buffer layer was more than 5nm, the C axes of YBCO layers had the same orientation of Ni[001] axes and if the thickness of the top buffer layer was less than.5nm, the C axes of YBCO layers had the normal orientation with respect to the surface of Ni tapes. Superconducting rings were fabricated by the process as follows. First Ni tapes were bonded by the way of atomic diffusion bonding process. the Ni tapes were bonded with 0.3Mpa zig pressure and 1000 ℃ temperature in the vacuum chamber. Second $YBCO/CeO_2/YSZ/CeO_2$ films were grown on the Ni rings. M-H of the superconducting ring was measured and the persistent current was calculated from the M-H loop. 12m long Ni tapes with buffer layers were fabricated. $CeO_2/YSZ/CeO_2$ films were deposited by the thermal evaporation deposition method. The partial pressure of water was maintained during deposition with the range between $1 × 10 ^{-7}$Torr and $2 × 10^{-5}$Torr . The temperature of Ni tapes was 700 ℃ during deposition. The Plasma effect on superconducting property of YBCO was studied in the DC magnetron sputtering system. Superconducting property of YBCO was deteriorated by incident ion flux and low density of oxygen radical particles. Deposition rate was regulated by the flow of carrier gas, Power and total partial pressure. $Nd{Ba_2}{Cu_3}{O_{7_ δ}}$films were deposited on the bi-crystals whose symmetric misorientation angles were 24 $^\circ$, 30 $^\circ$, 36.8 $^\circ$, 45 $^\circ$ respectively and $I_c-H$ hysteresis curves were measured and the curves were fitted by modeling. The H- field profile of grain boundary with increasing external filed was different from the H- field profile of grain boundary with decreasing external field. This induced $I_c-H$ hysteresis .

서지기타정보

서지기타정보
청구기호 {DPH 03010
형태사항 [vii], 107 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Ho-Sup Kim
지도교수의 한글표기 : 염도준
지도교수의 영문표기 : Do-Jun Youm
수록잡지명 : "Fabrication of YBCO coated conductor using nickel tapes textured in single crystalline qualities". Superconductor science and technology, v.13, 995-998 (2000)
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 104-107
주제 재결정화
초전도 링
완충층
YBCO
hysteresis
RABiTS
coated conductor
grain boundary
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