Flux pinning properties of GdBCO bulk through the infiltration and growth process

REBa₂Cu₃O_7-δ(RE123 or REBCO, RE=rare earth elements, Gd, Y, Nd, etc.) bulk high temperature superconductors (HTS) have been used in lots of aspects, such as in magnetic levitation, et al., owing to the performance of high magnetic flux trapping. GdBCO superconductor bulk with 25 mm diameter has been successfully fabricated by top-seeded infiltration and growth (TSIG) method. We chose YBa₂Cu₃O_7-δ (Y123) particles as the liquid source, which provide enough liquid sources during the growth and encourage the growth along a-b plane of GdBCO bulk. Then the existence of Y123 liquid source partly decreases the effect of the sub-grain boundaries in a-growth sectors and improves the properties of GdBCO bulk. The shape of the trapped field is close to circle. The critical current density of C2 and B2 (J_C ) enhances. The superconducting transition temperature (T_C ) is around 94.5K in the different position and keeps the superconducting properties. It is the important experimental data for the engineering applications of the superconductor bulk.