SYNTHESIS AND CHARACTERIZATION OF HIGH-TC Y-BA-CU-O SUPERCONDUCTING OXIDES BY COPRECIPITATION FROM TRIETHYLAMINE-OXALATE MEDIA

A modification of the oxalate coprecipitation process for preparing high-T(c) superconducting oxides is reported. The superconducting Y-Ba-Cu-O powders with T(c) up to 95.5 K have been prepared from an aqueous solution which contains Y, Ba and Cu salts via homogeneous coprecipitation using triethylamine and oxalic acid solution. The dried precipitate was found to have a specific surface area of 38.4 m2/g. Characterizations of the YBa2Cu3O(y) powder by X-ray diffraction (XRD), thermal analysis, scanning electron microscope (SEM), electron microprobe analysis (EMPA), electrical resistivity and magnetic susceptibility measurements are reported. This process might be employed for large quantity preparation of the YBa2Cu3O(y) system.