Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Heating – annealing – or sintering
Patent
1996-05-21
1998-08-25
Kopec, Mark
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Heating, annealing, or sintering
505482, 505742, 1741251, H01B 1202, H01L 3924
Patent
active
057983186
ABSTRACT:
The present invention provides a (Bi,Pb)SCCO-2223 oxide superconductor composite which exhibits improved critical current density and critical current density retention in the presence of magnetic fields. Retention of critical current density in 0.1 T fields (77 K, .perp. ab plane) of greater than 35% is disclosed. Significant improvements in oxide superconductor wire current carrying capacity in a magnetic field are obtained by subjecting the oxide superconductor composite to a post-processing heat treatment which reduces the amount of lead in the (Bi,Pb)SCCO-2223 phase and forms a lead-rich non-superconducting phase. The heat treatment is carried out under conditions which localize the lead-rich phase at high energy sites in the composite.
REFERENCES:
patent: 5376623 (1994-12-01), Tsai et al.
patent: 5430008 (1995-07-01), Morris
Y. Yaroskavsky et al. "Doping of BiSrCaCuO Compounds with (V+Y), As, Sb, Pb, Cr and Ge" Physica C 209:179-182 (1993) no month.
Y. Li et al. "Effect of V, Nb, and Ta Doping on the 2223 Phase Formation and the Crystal Structure in the BiSrCaCuO System" Journal of Solid State Chemistry 113:176-181 (1994) no month.
J.C. Grivel and R. Flukiger "A study of the stability of the (Bi,Pb).sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x phase in Ag-sheathed tapes" Physica C 235-240:505-506 (1994) no month.
M. Daumling et al. "Phase Coexistence and Critical Temperatures of the (Bi,Pb).sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x Phase under Partial Pressures of Oxygen between 10.sup.-3 and 0,21 bar with and without Additions of Silver" J. Mater. Res. (1995) no month.
S. Kobayashi et al. "Universality in Magnetic Field Dependencies of Critical Current for Ag-Sheathed Bi-2223 Superconducting Tapes" Proceedings ISS '95 no month.
J.A. Parrell and D.C. Larbalestier "Cooling Rate Effects on the Microstructure, Critical Current Density, and T.sub.c Transition of One- and Two-Powder BSCCO-2223 Ag-Sheathed Tapes" IEEE Transactions on Applied Superconductivity 5(2):1275-1278 (Jun., 1995).
W.S. Um et al. "Influence of Oxygen Deficiency on Electrical Properties in the Superconductor (Bi, Pb).sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.y Phase" Jpn. J. Appl. Phys. 32:3799-8303 (Sep. 1993).
W.S. Um et al. "Oxygen Behavior in the Superconductor (Bi, Pb).sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.y Phase Studied by I-Ray Photoelectron Spectroscopy" Jpn. J. Appl. Phys. 31:775-779 (Mar. 1992).
S. Kishida et al. "The Preparation of 110 K Pb-Doped Bi-Sr-Ca-Cu-O Superconducting Ceramics in Various Oxygen-Reduced Atmospheres" Phys. Stat. Sol. A 124:K117-K121 (1991) no month.
W. Zhu and P.S. Nicholson "The influence of oxygen partial pressure and temperature on Bi-Pb-Sr-Ca-Cu-O 110 K superconductor phase formation and its stability" J. Appl. Phys. 73(12):8423-8428 (Jun., 1993).
Y. Idemoto et al. "Oxygen nonstoichiometry of 2223 phase Bi-Pb-Sr-Ca-Cu-O system superconducting oxide" Physica C 181:171-178 (1991) no month.
J. Wang et al. "Effect of Post-annealing on T.sub.c in Pb-doped Bi-2223 Superconductors" Advances in Superconductivity V Proceedings of the 5th International Symposium on Superconductors (ISS '92) Nov. 16-19, 1992 Kobe, Japan.
K.W. Lay "Post Sintering Oxygen Pressure Effects on the Jc of BPSCCO-Silver Clad Tapes" Mat. Res. Symp. 275:651-661 (1992) no month.
Fleshler Steven
Li Qi
Michels William J.
Parrella Ronald D.
Riley, Jr. Gilbert N.
American Superconductor Corp.
Kopec Mark
LandOfFree
Reaction for high performance (Bi,Pb).sub.2 Sr.sub.2 Ca.sub.2 Cu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reaction for high performance (Bi,Pb).sub.2 Sr.sub.2 Ca.sub.2 Cu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reaction for high performance (Bi,Pb).sub.2 Sr.sub.2 Ca.sub.2 Cu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-36220