Enhancement of the High-Field J (c) properties of MgB2/Fe Tapes by Acetone Doping

We report the effect of acetone addition on in situ powder-in-tube processed MgB2/Fe tapes by using acetone as liquid additive. The amount of acetone was varied from 0 to 15 wt.%. We found that a significant J (c)-B enhancement was easily achieved in high field by acetone doping. At 4.2 K, the transport J (c) for the best acetone added tapes (5 wt.%) reached up to 2.4x10(4) A/cm(2) at 10 T. With increasing acetone concentration, the a-axis lattice parameters, B (c2) and B (irr), were not much changed; however, the insulating MgO impurities and pores gradually increased, thereby resulting in the obvious decrease of J (c) values for 10 and 15 wt.% acetone-added samples, especially within low field region.