Abstract
We investigated the superconducting properties of aromatic hydrocarbon added in situ-processed powder-in-tube (PIT) MgB2/Fe tapes. We used aromatic hydrocarbons such as benzene, naphthalene, thiophene, ethyltoluene, toluene and xylene. We found that these aromatic hydrocarbons were very effective for increasing the Jc values. X-ray diffraction analyses suggest that the substitution of carbon for boron occurred in these tapes. The Jc values of 20 mol% benzene-added tapes reached 130 A/mm2 at 4.2 K and 10 T. This value was almost comparable to that of 10 mol% SiC-added tapes. The 10 mol% ethyltoluene-added tape showed a Jc of 390 at A/mm2 4.2 K and 8 T. This value is higher than that of the 10 mol% SiC-added tape.
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