Abstract
Cylindrical single grains of GdBa2Cu3Oy (Gd-123) with a diameter of 25mm were successfully fabricated by melt-texture growth (MTG) process in air to study the influence of different starting powders on flux pinning. Measurements of the magnetic critical current density (Jc) showed that it was possible to fabricate large Gd-123 single grain with a high Jc at high temperatures and fields by means of properly controlling the starting powders of Gd2O3, BaCO3, and CuO before the MTG process.
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