Thermodynamic Analysis of Coprecipitation Route to Synthesize Bi-Based Superconductor Precursor Powder

Two issues in coprecipitation route to synthesize Bi-Pb-Sr-Ca-Cu-O Superconductor precursor powder, coprecipitation mode and coprecipitation medium, which are a first priority, are analysized based on thermodynamic principles. Experimental demonstration is also carried out. The results show that the opposite-sequence-titration mode, low surface-tension and viscosity medium help to maintain excellent compositional homogeneity and stoichiometry in coprecipitation product.