Improvement of critical current in MgB2 superconducting tapes.

Abstract

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.

Sonochemical modification of the superconducting properties of MgB2

“…1-8 Doping with different metals, 9,10 variation of stoichiometry, 11 and nonsuperconducting phase precipitation 12 are recent examples of the chemical tuning of superconducting materials. 14 Alternative synthetic routes 13,15 and postsynthesis treatments, 16 fabrication of dense wires, 17 pellets, 16 and tapes, 18 annealing in Mg vapor, 19 doping with Na, 20 Co, Fe, 21 Cu, or Ag, 10 introduction of SiC nanoparticles, 22 Ag powder, 23 Ti precipitates, 24 synthesis of MgB 2 /Mg nanocomposites, 25 intralayer carbon substitution 11,26 have all been reported. 1, 6,13 Various techniques to control pinning properties of MgB 2 have been suggested.…”

“…14 . Alternative synthetic routes 13,15 and post-synthesis treatments 16 , fabrication of dense wires 17 , pellets 16 and tapes 18 , annealing in Mg vapor 19 , doping with Na 20 , Co, Fe 21 , Cu, or Ag 10 , introduction of SiC nanoparticles 22 , Ag powder 23 , Ti precipitates 24 , synthesis of MgB 2 /Mg nanocomposites 25 , intra-layer carbon substitution 11,26 have all been reported. In this Letter, we report the sonochemical modification of grain morphology and intergrain coupling of polycrystalline MgB 2 .…”