Two-powder processes for the synthesis of superconducting (Bi, Pb)- 2223/Ag-clad wires by the oxide-powder-in-the-robe are provided. The first precursor powder, of nominal stoichiometry CaCuO.sub.x, is a solution-synthesized mixture of Ca.sub.0.45 Cu.sub.0.55 O.sub.2 and CaO. Using these oxide precursor mixtures, superconducting tapes with well- aligned grains and reproducible critical current densities J.sub.c in the range of 20,000 to 26,000 A/cm.sup.2 at 75 K in self-field after annealing less than 200 hours were obtained.
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机译：提供了用于通过长袍氧化物粉末合成超导（Bi，Pb）-2223 / Ag包覆线的两粉末工艺。标称化学计量为CaCuO x的第一前体粉末是Ca 0.45 Cu 0.55 O 2和CaO的溶液合成混合物。使用这些氧化物前驱体混合物，退火后不到200小时，在75 K时，具有良好排列的晶粒和可再现的临界电流密度Jc在20,000 K至26,000 A / cm 2范围内的超导带获得了。
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