Preparation and Superconducting Properties of Melt-textured Gd_1+xBa_2-xCu_3O_7-y Bulk Superconductor

the Gd＋Ba－Cuo (Gd123) bulk superconductor was prepared through the so-called MMTG process in the air. The superconducting transition temperature T for the sample subjected to post-annealing in oxygen atmosphere was 94K. The critical current Density J was determined to be 50000A/cm at 77k and 0T. The maximum trapped magnetic flux density has reached 0.51T at 77K at the enter of sample surface, which is approximately twice as large as the same-sized YBCuO (Y123) bulk sample