Patent ID: 8173579

Claim:
A method of fabricating a MgB 2 superconducting tape or wire which comprises: A) mixing starting material powder comprising magnesium (Mg) or magnesium hydride (MgH 2 ) and boron (B) in a range of 0.9:2 to 1.1:2 to produce a powder mixture, B) filling the powder mixture into a tube serving as a sheath material, C) forming the tube into a tape or wire, D) heat treating the tape or wire, E) removing the sheath from the tape or wire, F) obtaining MgB 2 superconducting powder from the tape or wire, wherein a MgB 2 superconducting powder having its critical current density (J c ) raised by its lowered crystallinity, and, by its higher potential for excellent grain connectivity, evaluated from full width of half maximum 002 peak for X-ray diffraction pattern of MgB 2 superconducting powder, larger than 0.002 nm, G) filling the superconducting powder into a tube, and H) forming the tube into a tape or wire.