Abstract
We fabricated in situ powder-in-tube-processed MgB2/Fe tapes using sub-micrometer Mg powder prepared by applying a thermal-plasma method or using aromatic hydrocarbons as additives, and investigated the superconducting properties. We found that the use of sub-micrometer Mg powder or aromatic hydrocarbons as additives was very effective for increasing the Jc value. The transport Jc value of 10mol% SiC-added tapes fabricated with sub-micrometer Mg powder reached 250A/mm2 at 4.2K and 10T. This value was about twofold higher than that of the 10mol% SiC-added tapes fabricated with commercial Mg powder. The transport Jc value of 20mol% benzene-added tapes reached 130A/mm2 at 4.2 K and 10T. This value was almost comparable to that of the 10mol% SiC-added tapes. Microstructural analyses suggest that this Jc enhancement is due to both the substitution of carbon for boron in MgB2 and the smaller MgB2 grain size.
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