研究者詳細 - 金　錫範

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Magnetic-field properties of high critical current density YBCO films deposited by TFA-MOD

SB Kim, S Murase, Y Yamada, T Araki, Hirabayashi, I

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 15 ( 2 ) 2645 - 2648 2005年6月

記述言語：英語出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

The critical current density, J(c), of metal-organic deposition process using trifluoroacetates (TFA-MOD) based YBCO films was measured between 20 K and 77 K in magnetic fields up to 9.5 T as a function of the field direction. C-axis oriented YBCO films was deposited on LaAlO3 single crystalline substrates and also on CeO2 buffered IBAD (YSZ/Hastelloy) substrates by TFA-MOD method. The obtained Jc values at 77 K and 0 T were 7 and 1.7 MA/cm(2) for LaAlO3 and IBAD substrates, respectively. High Jc values over 10(5) A/cm(2) were maintained up to 4 T (B//c-axis) for the LaAlO3 substrate and up to 3 T (B//c-axis) for the CeO2 buffered IBAD substrate. These results imply that TFA-MOD with simple fabrication process is very promising for the practical YBCO coated conductor. And the dependences on temperature and angular of the Jc at various external magnetic fields for some different thicknesses YBCO films was reported.

DOI： 10.1109/TASC.2005.847757

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Effects of Cu stabilizer configuration on thermal stability of Nb3Sn composite superconductors under cryocooling condition

K Watanabe, T Mitsuhashi, N Nanato, SB Kim, S Murase, G Nishijima, K Watanabe, K Miyoshi

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 15 ( 2 ) 3410 - 3413 2005年6月

記述言語：英語出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

It is known that current sharing effects of the stabilizer are limited in cryocooling conditions being different from poolboiling. Therefore we have studied stability under it, focusing on minimum quench energy (MQE) of Nb3Sn superconductors under various conditions of the applied magnetic field, temperature, and the transport current, for various volume fractions and configurations of Cu stabilizer. From the experimental results, the larger the external Cu volume fraction, the higher the MQE was obtained. All MQE data were summarized by only one line in characteristics of normalized MQE and normalized B (B/B-c2). The obtained MQE behavior was to be characterized by only one empirical equation. It is thought that the obtained formula is useful for a standard of designing the Nb3Sn superconductor and its coil under cryocooled condition.

DOI： 10.1109/TASC.2005.848946

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冷凍機冷却下におけるNb_3Sn超電導線のMQE評価式

三橋崇志, 渡部賢司, 村瀬暁, 金錫範, 七戸希, 西島元, 渡辺和雄

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 72 130 - 130 2005年5月

有効電力検出法を用いた高温超電導線材の交流損失測定

大沢利昭, 村瀬暁, 金錫範, 七戸希

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 72 2 - 2 2005年5月

AE信号の高精度測定・評価のためのウェーブレット変換による時間周波数可視化

七戸希, 村瀬暁, 金錫範

電気学会基礎・材料・共通部門誌（A部門誌) 125 ( 12 ) 1069 - 1070 2005年

記述言語：日本語出版者・発行元：The Institute of Electrical Engineers of Japan

AE (Acoustic Emission) techniques are universally used for investigating and watching the deformation and crack of various materials because they enable the non-destructive and continuous measurement. However, it is not always easy to clarify the main cause or mechanism of AE signal generation by its analysis and an AE sensor is generally vulnerable to the noise, and therefore advanced measurement and estimation techniques of AE signal are needed. In this paper, the authors present time-frequency visualization of AE signal using the wavelet transform. The proposed method enables especially precise measurement of the frequency band and generation time of AE signal and gives a clue in advanced AE techniques.

DOI： 10.1541/ieejfms.125.1069

CiNii Article

CiNii Books

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有効電力法による高温超電導線材の交流損失の簡易測定

七戸希, 大沢利昭, 村瀬暁, 金錫範

低温工学 40 ( 10 ) 420 - 424 2005年

有効電力検出法による超電導コイルの保護システムの開発

藤原賢司, 七戸希, 村瀬暁, 金錫範

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 71 56 - 56 2004年11月

Cu/Nb_3Sn線材の熱履歴の違いによる安定化銅の残留歪変化

木山和幸, 七戸希, 金錫範, 村瀬暁

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 71 91 - 91 2004年11月

超電導バルク体の捕捉磁場の変動磁場特性

信平篤志, 村瀬暁, 金錫範, 七戸希, 岡村晋吾, 井上卓哉, 松本康明

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 69 118 - 118 2003年12月

The effect of post-annealing process in NdGaO3 new seed layer for LPE

SB Kim, SI Yoo, Y Yamada

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 392 951 - 955 2003年10月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

Novel porous NdGaO3 (NGO) thin film was fabricated as a new seed layer for liquid phase epitaxy growth of YBa2Cu3O7-delta. The microstructure and crystallization mechanism of NGO new seed layer due to post-annealing temperature were revealed by high resolution SEM. Amorphous NGO layers on LaAlO3 single crystalline substrate obtained by pulsed laser deposition method at room temperature and this layer shows the very porous and columnar structure. And this amorphous NGO layers were annealed at wide temperature range below 1300 degreesC in air. Amorphous NGO layer begins to crystallize by post-annealed at 750 degreesC and its orientation gets better with increased annealing temperature. The thickness of NGO layers decrease with increased annealing temperature above 500 degreesC and the well-oriented NGO layers were obtained between 900 and 1300 degreesC. The NGO layers annealed at above 1100 degreesC show very dense film. (C) 2003 Elsevier B.V. All rights reserved.

DOI： 10.1016/S0921-4534(03)00862-1

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Microstructure of Nd-Ga-O-3 new seed layer for LPE growth of YBCO film

S Kim, SI Yoo, Y Yamada

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 13 ( 2 ) 2571 - 2574 2003年6月

記述言語：英語出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

The microstructure and crystallization mechanism of NdGaO3 (NGO) new seed layer for liquid phase epitaxy (LPE) growth of YBa2Cu3O7-delta (YBCO) were revealed using high resolution SEM and TEM. NGO layer deposited by PLD at room temperature shows that very porous and columnar structure and this layer indicated amorphous by x-ray analysis. Amorphous NGO layer was crystallized with good in-plane and out of plane orientations keeping columnar structure by simple post annealing process. Biaxially aligned YBCO thick films were successfully fabricated on oriented novel porous NGO new seed layer: Although many cracks were observed for normally LPE grown YBCO films on NGO(110) single crystalline substrate; it was crack-free formed on porous NGO(100) film.

DOI： 10.1109/TASC.2003.811851

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YBa2Cu3O7-δ deposition on Ni-Cr alloy tape by liquid phase epitaxy method

Y. Yamada, T. Suga, H. Kurosaki, S.B. Kim, T. Maeda, Y. Yamada, I. Hirabayashi, Y. Iijima, K. Kakimoto, T. Saitoh

Physica C 378 971 - 974 2002年10月

低温LPE法によるNi合金基板上のYBCO膜

山田容士, 金錫範, 須賀俊裕, 山田穣, 平林泉, 飯島康裕, 柿本一臣, 斎藤隆

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 65 17 - 17 2001年11月

低温LPE法によるYBCO膜の超電導特性

山田容士, 金錫範, 須賀俊裕, 山田穣, 平林泉

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 65 88 - 88 2001年11月

YBCO thin films on multilayers prepared by all-chemical solution deposition processing

H. Hiei, K. Yamagiwa, Y. Takahashi, S. B. Kim, Y. Yamada, J. Shibata, T. Hirayama, H. Ikuta, I. Hirabayashi, U. Mizutani

Physica C: Superconductivity and its Applications 357-360 ( 1 ) 942 - 945 2001年9月

記述言語：英語

The chemical solution deposition (CSD) technique has been applied to prepare both YBa2Cu3O7-δ (YBCO) and buffer layers on a YSZ substrate. Y2O3 and CeO2 were employed as the buffer layers, and it was confirmed that they grew epitaxially by the CSD method. Cross-sectional transmission electron microscope observations revealed that Y2O3 grew up to the top of the film. Furthermore, the YBCO film on the Y2O3 or CeO2/Y2O3 layers were c-axis aligned and showed a good in-plane alignment. The transition temperature and the critical current density of the YBCO/Y2O3/YSZ multilayer were 89 K and 4 × 104 A/cm2 at 77 K, 0 T, respectively. © 2001 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0921-4534(01)00448-8

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Critical current density and related microstructures of TFA-MOD YBCO coated conductors

Y Yamada, S Kim, T Araki, Y Takahashi, T Yuasa, H Kurosaki, Hirabayashi, I, Y Iijima, K Takeda

PHYSICA C 357 1007 - 1010 2001年8月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

Metalorganic deposition process using trifluoroacetate (TFA-MOD) processed YBCO film on LaAlO3 and IBAD (YSZ/Hastelloy) substrate exhibited high critical current density, J(c), at 77.3 K. The obtained J(c) values at 0 T were 7 and 1.7 MA/cm(2) for LaAlO3 and CeO2 buffered IBAD, respectively. High J(c) values over 10(5) A/cm(2) were maintained up to 4 T (B parallel toc-axis) for the LaAlO3 substrate and up to 3 T (B parallel toc-axis) for the CeO2 buffered IBAD substrate. These results imply that TFA-MOD with simple fabrication process is very promising for the practical YBCO coated conductor. (C) 2001 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0921-4534(01)00471-3

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液相エピタキシャル法によるYBCO膜の超電導特性

山田容士, 金錫範, 須賀俊裕, 山田穣, 平林泉, 飯島康裕, 柿本一臣, 斎藤隆

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 64 20 - 20 2001年5月

LPE法を用いた金属基板上への成膜を目的としたYBCO成長温度の低温化

須賀俊裕, 山田容士, 金錫範, 前田敏彦, 山田穣, 平林泉, 芳野久士, 山崎六月, 張庭清

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 64 19 - 19 2001年5月

配向NiO/Niテープ上でのYBa_2Cu_3O<7-δ>の低温液相エピタキシャル成長の検討

前田敏彦, 黒崎晴彦, 須賀俊裕, 金錫範, 山田容士, 渡部智則, 平林泉

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 64 21 - 21 2001年5月

LPE法によるYBCO超電導線材作製における新種膜に関する検討

金錫範, 山田容士, 須賀俊裕, 前田敏彦, 山田穣, 渡部智則, 平林泉

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 64 112 - 112 2001年5月

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