The fabrication of fine and homogenous Bi-2223 precursor powder by a spray pyrolysis process

摘要

Spherical and fine BSCCO precursor powders were prepared by an ultrasonic spray pyrolysis (SP) method from an aqueous solution of metal nitrates. The synthesized precursor powders had a narrow particle size distribution and a low carbon content of less than 80 ppm. The reactivity of the precursor powder made by the SP method is very high; this is attributed to the fine particle size and narrow size distribution of the precursor powders. The precursor powder made by the SP method promoted a very quick formation of the BSCCO 2223 phase for short sintering times, while the secondary phases such as large alkaline earth cuprates and Ca2PbO4 were minimized for SP tapes.