Gd2Ba4CuMoOy (Gd2411) single phase was synthesized in air and added into GdBa2Cu3O 7-δ (Gd123) bulk superconductors with the addition amount ranging from 0.2% to 20%, in molar ratio to Gd123. Both microstructure and superconducting properties of each bulk were investigated from the seed position to the boundary of a single domain. Although a band structure with the alternative distribution of Gd2BaCuO5 (Gd211) and Gd2411 appeared in all samples, the range of this inhomogeneity only appeared within 5 mm from each side of the seed. The critical current density (Jc) shows that Gd2411 plays an important role in the control of the local superconducting properties. The highest Jc reached 84 500 A cm -2 at 77 K under the self-field in the sample with 0.4% addition of Gd2411.
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