Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – Superconductor next to superconductor
Patent
1994-10-06
1997-01-07
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature devices, systems, apparatus, com- ponents,...
Superconductor next to superconductor
505434, 505780, 252521, 428375, 428403, C04B 35505, C04B 35622, B32B 1800
Patent
active
055916961
ABSTRACT:
A corrosion resistant high temperature superconductor and a method of preparing said superconductors involving substitution of ions in the lattice to relieve stress and strain caused by mismatched bond lengths. Specific examples of such superconductors are Y.sub.1-y Ca.sub.y Ba.sub.2-y La.sub.y Cu.sub.3 O.sub.7-d where O<y<1.0 and O<d<1 and YBa.sub.2-y Sr.sub.y Cu.sub.3 O.sub.7-d where 0<y<2 and O<d<1. In YBa.sub.2 Cu.sub.3 O.sub.7-d structure, the internal stresses estimated from the difference between the bond valence sum and the formal oxidation state for Ba and Cu ions indicate that the Ba atom is too large for Cu--O cage at oxygen stoichiometric d=0 and too small at d=1. Therefore, the Ba (1.52 .ANG.) is substituted by La (1.27 .ANG.) and for keeping the same oxidation state of Cu as in the prototype material the Ca (1.12 .ANG.) equivalent to La replaces the Y (1.019 .ANG.).
REFERENCES:
patent: 5124310 (1992-06-01), Ovshinsky et al.
patent: 5130295 (1992-07-01), Labib
patent: 5212151 (1993-05-01), Takano et al.
patent: 5212152 (1993-05-01), Lyon et al.
patent: 5229358 (1993-07-01), Kumar
patent: 5264412 (1993-11-01), Ota et al.
patent: 5272133 (1993-12-01), Josefowicz et al.
patent: 5288697 (1994-02-01), Schrepp et al.
patent: 5502029 (1996-03-01), Doi et al.
Matsumoto et al "Superconducting Y.sub.1-x L.sub.x Ba.sub.2-y M.sub.y Cu.sub.3-z N.sub.z O.sub..delta. System . . . " Mater. Res. Bull. vol. 23, No. 9, Aug. 1988 pp. 1241-1246.
Bansal, N. P., "Chemical Stability of High-Temperature Superconductors," NASA Technical Memorandum 105391, Feb. 1992.
Bansal and Sandkuhl, "Chemical durability of high-temperature superconductor YBa.sub.2 Cu.sub.3 O.sub.7-x in aqueous environments," Appl Phys Lett 52(4):323-325, Jan. 1988.
Barkatt et al., "Corrosion of Ceramic Superconductors: An Overview," Corrosion of Glass, Ceramics and Ceramic Superconductors, Ch. 19, pp. 548-582, 1992.
Barns and Laudise, "Stability of superconducting YBa.sub.2 Cu.sub.3 O.sub.7 in the presence of water," Appl Phys Lett 51(17):1373-1375, Oct. 26, 1987.
Chaudhari et al., "Inhibition of aqueous degradation of Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-x high-T.sub.c superconductor by nitrogen ion implantation," J Appl Phys, 66(9):4509-4511, Nov. 1, 1989.
DeGuire et al., "Thermosetting epoxy as a moisture-resistant coating for YBa.sub.2 Cu.sub.3 O.sub.7," J Materials Sci, 25:2881-2885, 1990.
Ichikawa et al., "Effect of Overcoating with Dielectric Films on the Superconductive Properties of the High-T.sub.c Y-Ba-Cu-O Films," Japanese Journal of Applied Physics Part 2--Letters, 27(3):L381-L383, 1988.
Jia and Anderson, "Characterization of hydrofluoric acid treated Y-Ba-Cu-O oxides," J. Mater. Res., 4(6):1320-1325, 1989.
Komori et al., "Chemical durability of a superconducting oxide YBa.sub.2 Cu.sub.3 O.sub.x in aqueous solutions of varying pH values," Journal of Materials Science, 24:1889-1894, 1989.
Hill et al., "Passivation of high T.sub.c superconductor surfaces with CaF.sub.2 and Bi, Al, and Si oxides," Appl. Phys. Lett., 53(17):1657-1659, 1988 Oct.
McDevitt et al., "Electrochemistry at YBa.sub.2 Cu.sub.3 O.sub.7 Superconductor Electrodes at Temperatures Above T.sub.c," J. Electroanal. Chem., 243:465-474, 1988.
Meyer et al., "Reactivity and passivation for Bi adatoms on YBa.sub.2 Cu.sub.3 O.sub.6.9 and Bi.sub.2 Ca.sub.1+x Sr.sub.2-x Cu.sub.2 O.sub.8+y," Appl. Phys. Lett., 53(11):1004-1006, 1988 Sep.
Nagai et al., "Amorphous Fluoropolymer Films for Superconductive Microwave Components Using High-T.sub.c Superconducting Films," Japanese Journal of Applied Physics, 30(11A):2751-2755, 1991 Nov.
Reddy et al., "Effective passivation of YBaCuO superconducting bridges by photoresist overlayers," Cryogenics, 31:209-211, 1991.
Riley and McDevitt, "Electrochemically assessed corrosion reactivity of YBa.sub.2 Cu.sub.3 O.sub.7 electrodes," J. Electroanal. Chem., 295:373-384, 1990.
Riley et al., "Electrochemical Investigations of Various High-Temperature Superconductor Phases," Chem. Mater., 4:1176-1181, 1992.
Riley et al., "Relative Reactivity Trends of High Temperature Superconductor Phases," Mat. Res. Soc. Symp. Proc., 275:711-716, 1992.
Riley et al., "Environmental Reactivity Characteristics of K.sub.3 C.sub.60 and YBa.sub.2 Cu.sub.3 O.sub.7-x High-Temperature Superconductor Thin Films," Solid State Communications, 88(6):431-434, 1993.
Rosamilia et al., "Aqueous Electrochemistry of Cuprate-Based High T.sub.c Superconductors," Journal of The Electrochemical Society, 1863-1864, 1987. Jul.
Sato et al., "Stabilization of Ba.sub.2 YCu.sub.3 O.sub.7-.delta. by Surface Coating with Plasma Polymerized Fluorocarbon Film," Japanese Journal of Applied Physics, 27(11):L2088-L2090, 1988. Nov.
Vasquez et al., "Reduced reactivity to air on HF-Treated YBa.sub.2 Cu.sub.3 O.sub.7-x surfaces," Appl. Phys. Lett., 54(23):2373-2375, 1989. Jun.
Xi et al., "Electric field effect in high T.sub.c superconducting ultrathin YBa.sub.2 Cu.sub.3 O.sub.7-x films," Appl. Phys. Lett., 59(26):3470-3472, 1991. Dec.
Yan et al., "Water interaction with the superconducting YBa.sub.2 Cu.sub.3 O.sub.7 phase," Appl. Phys. Lett., 51(7):532-534, 1987. Aug.
Zhou and McDevitt, "Corrosion Reactions of YBa.sub.2 Cu.sub.3 O.sub.7-x and Tl.sub.2 Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub.10+x Superconductor Phases in Aqueous Environments," Chem. Mater., 4:953-959, 1992.
Zhou and McDevitt, "Reaction of the Oxygen-Deficient YBa.sub.2 Cu.sub.3 O.sub.6 Phase with Water," Solid State Communications, 86(1):11-14, 1993.
Zhou et al., "Relative Corrosion Reactivity and Surface Microstructure of YBa.sub.2 Cu.sub.3 O.sub.7-x Samples with Different Oxygen Contents," Chem. Mater., 361-365, 1993.
Zhou et al., "Environmental reactivity characteristics of copper-oxide superconductors," Appl. Phys. Lett., 63(4):548-550, 1993. Jul.
Zhou et al., "Chemically Tailored, Corrosion Resistant, High-T.sub.c Phases," J. Am. Chem. Soc., 116(20):9389-9390, 1994, Oct. 5.
Barkatt et al., "Environmental Stability of High T.sub.c Superconducting Ceramics", MRS Bulletin, Sep. 1993, pp. 45-52.
Brown, "A Determination of the Oxidation States and Internal Stresses in Ba.sub.2 YCu.sub.3 O.sub.x1 X=6-7 Using Bond Valences," Journal of Solid State Chemistry X2, 1989, 122-131.
Mannhart et al., "Electric Field Effect on Superconducting YBa.sub.2 Cu.sub.3 O.sub.7-.delta. Films," Z. Phys. B--Condensed Matter, 83, 1991, pp. 307-311.
McDevitt et al., "Synthesis and Study of Chemically Tailored, Corrosion Resistant High-T.sub.c Phases," American Chemical Society Spring Meeting, Mar. 13-17, 1994, Abstract No. 538.
McDevitt et al., "Optical Studies of Dye-Coated Superconductor Junctions," American Chemical Society Spring Meeting, Mar. 13-17, 1994, Abstract No. 342.
McDevitt et al., "Conductive Polymer Switch for Controlling Superconductivity," American Chemical Society Spring Meeting, Mar. 13-17, 1994, Abstract No. 250.
McDevitt et al., "Fabrication and Study of Hybrid Molecule/Superconductor Assemblies," American Chemical Society Spring Meeting, Mar. 13-17, 1994, Abstract No. 190.
McDevitt et al., "Atomic Force Microscopy Studies of Conductive Polymer Structures Grown onto High T.sub.c Superconductor Films," American Chemical Society Spring Meeting, Mar. 13-17, 1994, Abstract No. 176.
McDevitt et al., "Fabrication and Study of Molecule/Superconductor Structures and Devices," American Chemical Society National Meeting, Aug. 21-25, 1994, Abstract No. 185.
McDevitt et al., "Conductive Polymer/Superconductor Bilayer Structures," American Chemical Society National Meeting, Aug. 21-25, 1994, Abstract No. 258.
Taguchi, "Effect of Lattice Distortions on 90-K Class Superconductors: Y.sub.1-x Eu.sub.x Ba.sub.x Cu.sub.3 O.sub.7-.delta., Yb.sub.1-x Sm.sub.x Ba.sub.2 Cu.sub.3 O.sub.7-.delta. and Eu(Ba.sub.1-x Sr.sub.x).sub.2 Cu.sub.3 O.sub.7-.delta.," Japanese Journal of Applied Physics, 27(6):L1058-L1060 (1988). Jun.
International Search Report Dated Feb. 29, 1996.
McDevitt John T.
Zhao Jianai
Zhou Ji-Ping
Board of Regents , The University of Texas System
Kopec M.
Lieberman Paul
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