Property and Structure of YBa2Cu3Ox-Ag Composites Prepared from Nitrate Solutions

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Abstract
Mixtures of Y, Ba, Cu, and Ag nitrate aqueous solutions (nominal molten ratio of Y:Ba:Cu=1:2:3) were evaporated to dryness. The dried powders were codecomposed at 850°C in air, and sintered at 920°C for 20 h in O2. The phases were only orthorhombic YBa2Cu3O x and Ag. The bulk density, grain size, and critical current density (J c) increased with increasing amount of Ag≦5 wt%: for instance, up to 5.65 g/cm3, 30 µm, and 215 A/cm2, respectively. The critical temperature (T c(zero)) was about 91 K (with a width of 1–2 K) and insensitive to the amount of Ag≦5%. With addition of Ag, the degradation in moisture was improved.