Superconducting Properties of Ti3SiC2-Doped Bulk MgB2 Superconductor

Abstract The effects of Ti 3 SiC 2 doping on lattice parameter ( a ), microstructure, critical temperature ( T c ) and critical current density ( J c ) of MgB 2 superconductors were studied. Carbon substitution for boron could be confirmed by the shrinkage of the lattice parameter a with increasing of Ti 3 SiC 2 doping level. A reduction of T c from 37.15 K to 36.55 K with increasing of Ti 3 SiC 2 doping was observed. The J c values were determined by M-H hysteresis loops. Results show that in low magnetic field region, the J c value for the undoped sample is higher than those for the doped samples. However, with the increase of the magnetic field, the J c for the properly doped samples will be enhanced.