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The microstructures and superconducting properties of MgB2 tapes processed in-situ by a ball-milling method

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6 Author(s)
Matsumoto, A. ; Supercond. Mater. Center, Nat. Inst. for Mater. Sci., Tsukuba, Japan ; Kumakura, H. ; Kitaguchi, H. ; Hatakeyama, H.
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We investigated the microstructures and superconducting properties of MgB2 tapes fabricated by an in situ powder-in-tube method using ball-milled powders. The ball-milling technique was briefly applied to various powders, such as Mg, MgH2, and B powder, and to powder mixtures of Mg and B, MgH2 and B, and Mg+B+SiC. They were heat treated at the relatively lower temperature of 600°C for 1 hour under an argon gas atmosphere. Though the ball-milling had almost no effect on the critical current density (Jc) values when we used MgH2 powder, we did observe a clear effect for Mg powder. Significant enhancements of the Jc values were obtained for the ball-milled powders of Mg+B and Mg+B+SiC. For the latter powder, we obtained a Jc value of 1.2×104 A/cm2 at 4.2 K and 10 T. Those values are nearly equal to the excellent values of the in-situ processed tape of MgH2+B+SiC powder that was not ball-milled. The high Jc values may be due to the fine B powder abrading Mg particles in the ball-milling processing, thereby producing fresh Mg and B surfaces.

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Applied Superconductivity, IEEE Transactions on  (Volume:15 ,  Issue: 2 )