Licensable Technologies : Materials : Sensors

Synthesis of Bipbsrcacuo Superconductor

Abstract
Two-powder process for the synthesis of superconducting (Bi,Pb)-2223/Ag-clad wires by the oxide-powder-in-the-tube process is described. The first powder, of nominal stoichiometry Bi1.8Pb0.4Sr2CaCu2O, is a mixture of (Bi,Pb)-2212 and Ca2PbO.4. The second powder, of nominal stoichiometry CaCuO2, is a solution-synthesized mixture of Ca0.45Cu0.55O2 and CaO. Using these oxide precursor mixtures superconducting tapes were obtained with well-aligned grains, and reproducible critical current densities Jc in the range of 20,000-26,000 A/cm2 at 75 K in self-field after anneals at 815?C in 10% O2 in less than 200 hours. The decrease in annealing time, relative to other two-powder processes, is due to the increase in reactivity and reaction paths of the Ca0.45Cu0.55O2 precursor.

IP Status: Available both Exclusively and Non Exclusively

Reference Number: 564

S Number: DOE reference no.(s): 78,394

Patents & Applications:
United States National Patent Number 5569641 Issued on 10/29/1996

Posted: 10-01-2004

Contact
John Russell
Technology Transfer Division
Los Alamos National Laboratory
P.O. Box 1663, MailStop C334
(505) 665-3941
jrussell@lanl.gov