Abstract
We fabricated in situ powder-in-tube processedMgB2/Fe tapes using the aromatic hydrocarbons benzene, naphthalene, and thiopheneas additives, and investigated the superconducting properties. We foundthat these aromatic hydrocarbons were very effective for increasing theJc values.The Jc values of 20 mol% benzene-added tapes reached130 A mm−2 at 4.2 K and 10 T. This value was almost comparable to that of 10 mol% SiC-added tapes and aboutfour times higher than that of tapes with no additions. Microstructural analyses suggest that thisJc enhancement is due to both the substitution of carbon for boron inMgB2 and thesmaller MgB2 grain size.
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