Synthesis of Ag-clad (Bi,Pb)-2223 tapes by an alternative precursor route

✍ Scribed by M.G. Smith; J.O. Willis; D.E. Peterson; J.F. Bingert; D.S. Phillips; J.Y. Coulter; K.V. Salazar; W.L. Hults

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 572 KB
• Volume: 231
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)90652-1

✦ Synopsis

An alternative two-powder process for the synthesis of superconducting (Bi,Pb)-2223/Ag clad wires by the powder-in-thetube (OPIT) process is described. The first powder, of nominal stoichiometry Bil.sPbo.4Sr2CaCu2Os, is a mixture of (Bi,Pb)-2212 and Ca2PbO4. The second powder, of nominal stoichiometry CaCuO2, is a solution-synthesized mixture of Cao.45Cuo.5502 and CaO. Using these oxide precursor mixtures, we obtain tapes with well-aligned grains, and reproducible critical current densities Jc in the range of 20 000-26 000 A/cm 2 at 75 K in self-field after anneals at 815 °C in 10% 02 in less than 200 h. The decrease in annealing time, relative to other two-powder processes, may be due to the increase in reactivity and possible reaction paths of the Cao.45Cuo.5502 precursor. Results on tapes prepared using other processing conditions are also reported.