Abstract
Bulk Gd–Ba–Cu–O superconductors were melt processed in air. The Gd 2BaCuO 5 (Gd211) particles dispersed in the melt-textured bulk could be refined by employing fine Gd211 starting powders. Since T c of the bulk samples was lowered with decreasing the size of Gd211 particle, J c was not improved. However, we found that a depression of T c was prevented by Ag addition, leading to higher J c values. The J c of Gd–Ba–Cu–O/Ag with Gd211 particles about 0.7 μ m in size exhibited 60 000 A/cm 2 at 77 K and self-field.
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