CARBON-FREE BI2223 - SYNTHESIS

Common routes to the fabrication of bulk Bi2223 superconducting materi al often involve carbonates as precursors, leading to the presence of carbon residues on grain boundaries, which in turn results in weak lin ks and there fore low critical current densities. With the help of the rmoanalytical and other techniques, we have investigated alternative p rocedures. A four-step process has been developed, by which carbon-fre e Bi2223, with or without Pb, can he synthesised.