Scully, Scott, Murphy & Presser
Precipitation process for forming Bi-Pb-Sr-Ca-Cu-O superconductors by dissolving nitrate salts in acid and adding a solution of triethylamine and oxalic acid
 A process for preparing powder of high temperature oxide superconductors of Bi-Pb-Sr-Ca-Cu-O type. In an aqueous solution of nitrate salts of Bi, Pb, Sr, Ca, and Cu metals, an appropriate ratio of triethylamine/oxalic acid was added to form a coprecipitate. Through the process of calcination at a temperature in the range of 750.degree. C. to 800.degree. C. and sintering at a temperature of 860.degree. C., a uniform and fine powder superconductive metal oxide having a critical temperature of 110K is obtained as the final product. 
Industrial Technology Research Institute
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Cheng-Yei Ru-Shi Chau-Ting
Shei Liu Chang