Superconductivity of YBa_2Cu_3O_<7-x> by Addition of Reactive Fine Powders
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概要
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We report a new method for introducing pinning centers by partial melting processing using reactive fine powders, such as SiC, SiO_2, Al_2O_3, and ZrO_2. Since this method lowers processing temperature, it may become a useful technique for the production of high-J_c metal-sheathed tapes and wires. YBCO powders were mixed with 25 mol% SiC powder of 0.3 μm, sintered at 980℃ for 15 min and cooled at 3℃/h under flowing oxygen gas. The obtained samples show prominent grain growth and reacted phases (Y_2BaCuO_5, Ba_2SiO_4) which are of submicron size and uniformly dispersed in the YBCO matrix. Magnetic measurements show the improvement of the critical currents (over 7500 A/cm^2 at 77 K 0.04 T), and the sample shows the so-called fishing behavior at 77 K. It seems that the reacted phases (Y_2BaCuO_5, Ba_2SiO_4) work as effective pinning centers.
- 社団法人応用物理学会の論文
- 1991-02-15
著者
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Tanaka Syoji
Superconductivity Research Laboratory International Superconductivity Technology Center
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Nishio K
Department Of Electrical And Electronic Engineering Toyohashi University Of Technology
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Ogawa N
Sci. Univ. Tokyo Chiba Jpn
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Hirabayashi I
Superconductivity Research Laboratory International Superconductivity Technology Center
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Hirabayashi Izumi
Superconductivity Research Laboratory International Superconductivity Technology Center
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SAKAI Takenobu
Superconductivity Research Laboratory
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NISHIO Kozi
Superconductivity Research Laboratory
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OGAWA Naoyuki
Superconductivity Research Laboratory
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Hirabayashi Izumi
Superconductivity Research Laboratory (SRL), International Superconductivity Technology Center (ISTEC), 1-10-13 Shinonome, Koto-ku, Tokyo 135-0062, Japan
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TANAKA Syoji
Superconductivity Research Laboratory
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