earticle

영어

To improve in-field critical current densities (Jc) of GdBa2Cu3O7-δ (GdBCO) coated conductors(CCs) fabricated by the reactive co-evaporation by deposition and reaction (RCE-DR) process, employing the nominal composition of Gd:Ba:Cu=1:1:2.5, we tried to refine the Gd2O3 particles trapped in the GdBCO superconducting matrix. For this purpose, we carefully selected the processing conditions on the stability phase diagram of GdBCO for this composition. By lowering the growth temperature of Gd2O3 in the liquid, we could refine the average particle size of Gd2O3 particles trapped in the GdBCO matrix and also achieve the zero-resistive transition temperatures (Tc,zero) of 92.3~94.2 K. Unfortunately, however, it was unsuccessful to achieve enhanced in-field Jc values from these samples because of an air-contamination of the amorphous precursor film before its conversion into crystalline GdBCO film, suggesting that any exposure of the amorphous precursor film to air is fatal in obtaining high performance GdBCO CCs via the RCE-DR process.