低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
解説
有機酸溶液処理を施したMgB2 粉を用いて作製したex-situ 法線材における炭素置換と超伝導特性
藤井 宏樹
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ジャーナル フリー

2011 年 46 巻 1 号 p. 2-9

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抄録
Fe-sheathed MgB2 superconducting tapes were prepared through an ex-situ process and powder-in-tube (PIT) technique using powders treated in organic acid solutions. The treatment realizes the substitution of carbon, derived from the remnants of the organic solvents being adsorbed onto the surface of MgB2 grains, into boron in MgB2 and pulverization of MgB2grains. The amount of carbon substitution is x = 0.02−0.03 in MgB2-xCx. The carbon substitution is effective for increasing Bc2,and grain boundaries act as pinning centers. Therefore, this improves the Jc property of tapes in the high-magnetic-field region.Depending on the solution, the Jc values at 4.2 K and 10 T increase up to ten times compared to tapes using powders withouttreatment. These values are comparable to those obtained for the ex-situ processed tapes with the best-ever reported performance.Tapes using MgB2-xCx (x ≥ 0.05) powders clearly show weak grain coupling, and hence the enhancement of transport Jc is limited.
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© 2011 公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)
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