We studied the effect of the combined addition of Pt and CeO2 on the dispersion of secondary phase Gd2BaCuO5 (Gd-211) particles in melt-processed (Nd0.33Eu0.33Gd0.33)Ba2Cu 3Oy (NEG-123) by varying the CeO2 content from 0 to 3%. Scanning electron microscopy revealed that submicrometre-sized Gd-211 particles were distributed uniformly throughout the NEG-123 matrix for additions of up to 2 mol% CeO2. The critical current density (Jc) increased with increasing CeO2 content, particularly at low magnetic fields. The zero-field Jc value reached its maximum of 100 kA cm-2 at 77 K for 1 mol% CeO2. An improvement in low-field Jc was attributed to the refinement of Gd-211 particles.
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