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We report on significant flux pinning enhancement in MgB2/Fe tapes that hasbeen easily obtained by a simple and cheap route using acetone as both anefficient ball-milling medium and liquid additive through the in situ method.Results showed that the highly reactive C released from the decomposition ofthe acetone substituted into B sites, accompanied by the grain refinementeffect due to the acetone doping. At 4.2 K, the transport Jc for the 5 wt %acetone doped tapes sintered at 700C reached up to 2.4x10^4 A/cm^2 at 10 T,which is even higher than that of the nano-C added samples heated at 900C.

A cheap liquid additive from acetone for strong in-field Jc enhancement in MgB2 conductors