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Abstract:
High performance Fe-cladded MgB2 taps were prepared by the in situ powder-in-tube method utilizing very cheap stearic acid (C18H36O2) as dopants. The amount of stearic acid was varied from 0 to 30 wt%. We found that a significant enhancement of J(c), H-irr, and H-c2 in comparison with undoped samples was easily achieved. At 4.2 K, the transport J(c), for the best doped tapes (10 wt%) reached 2 x 10(4) A/cm(2) at 10 T and 3.7 x 10(3) A/cm(2) at 14 T, respectively, an order of magnitude higher than for the pure tapes. In particular, at 20 K, the irreversibility field of the 10 wt% doped tape was around 10 T, which is comparable to the upper critical field of the commercial NbTi at 4.2 K. The results demonstrate great potential of MgB2 tapes for superconducting magnets.
