Michael E Smith
Engineers in Los Alamos, NM
License number
Utah 164788-2202
Issued Date
Nov 20, 1982
Expiration Date
Dec 31, 2002
Category
Engineer/Land Surveyor
Type
Professional Engineer
Address
Address
Los Alamos, NM
Professional information
Synthesis Of Bi.sub.1.8 Pb.sub.0.4 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x Superconductor
US Patent:
5569641, Oct 29, 1996
Filed:
Apr 10, 1995
Appl. No.:
8/419485
Inventors:
Michael G. Smith - Los Alamos NM
Assignee:
University of California
Los Alamos National Laboratory
Los Alamos National Laboratory
International Classification:
C04B 35622, C04B 3564, H01B 1200
US Classification:
505433
Abstract:
Two-powder processes for the synthesis of superconducting (Bi, Pb)-2223/Ag-clad wires by the oxide-powder-in-the-robe are provided. The first precursor powder, of nominal stoichiometry CaCuO. sub. x, is a solution-synthesized mixture of Ca. sub. 45 Cu. sub. 55 O. sub. 2 and CaO. Using these oxide precursor mixtures, superconducting tapes with well-aligned grains and reproducible critical current densities J. sub. c in the range of 20,000 to 26,000 A/cm. sup. 2 at 75 K in self-field after annealing less than 200 hours were obtained.