Precipitation Behavior of Metal Ions in the Preparation of YBa2Cu3Oy and (Bi,Pb)2(Sr,Ca)4Cu3Oy Superconductive Materials in 8-Hydroxyquinoline-diethylamine Media

To prepare the YBa₂Cu₃O_y (Y-123) and (Bi, Pb)₂(Sr, Ca)₄Cu₃O_y (Bi-2223) superconductive materials, coprecipitation was used with 8-hydroxyquinoline (oxine) as precipitant to ensure complete precipitation. Various aspects of competitive reactions such as dissociation, precipitation, complex formation and association in the aqueous solution system containing metal ions, oxinate ion and diethylamine species have been explored in order to discover the optimal coprecipitation conditions of the title system. Experiments were conducted to confirm these conditions.