MgB 2 commercial powder was encased in a Ni tube and rolled into a monocore tape of about 5 mm in width and 0.3 mm in thickness. Different kinds of metal powder, i.e., In, Sn, Ag, Cu and Ni, were added to the MgB 2 core. Addition of the low melting point metal powder, e.g., In and Sn, has been found to enhance significantly the value in MgB 2 tapes. Annealing at a low temperature yields further increase in the of tapes with In and Sn addition. The enhancement in by the In addition and the low temperature annealing reaches a factor of 6-7. The of the tapes with 10vol% In addition, annealed at 200 C for 10 h is on the order of 10 5 A/cm 2 at 4.2 K and 0.5 T. The TEM observation shows that In fills up the gaps among MgB 2 grains. The additional annealing produces better impregnation of In in the core. The improvement in grain linkage seems to be the probable origin for the enhancement in by the In addition. The optimum amount of In addition to the MgB 2 core is likely 10-15vol%. Ag, Cu and Ni powder addition yields no apparent effect on of PIT MgB 2 tapes.Index Terms-Critical current, metal powder addition, MgB 2 superconductor, powder in tube.
Newly discovered MgB2 superconducting tapes have been prepared by PIT process. The critical current (Ic) of the Ni-sheathed MgB2 tapes with 10 vol% In and Sn addition excesses 300 A at 4.2K, corresponding to above the critical current density (Jc) of 40,000 A/cm2. The addition of powder metals with low melting point improves the Ic for the MgB2 superconducting tapes.
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