Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1990-09-28
1992-02-04
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505725, 505742, 505737, 505780, 252518, 252521, 423593, 501123, H01L 3912, C01F 1700
Patent
active
050860348
ABSTRACT:
An improved method for the preparation of single phase, fine grained ceramic materials from precursor powder mixtures where at least one of the components of the mixture is an alkali earth carbonate. The process consists of heating the precursor powders in a partial vacuum under flowing oxygen and under conditions where the partial pressure of CO.sub.2 evolved during the calcination is kept to a very low level relative to the oxygen. The process has been found particularly suitable for the preparation of high temperature copper oxide superconducting materials such as YBa.sub.2 Cu.sub.3 O.sub.x "123" and YBa.sub.2 Cu.sub.4 O.sub.8 "124".
REFERENCES:
patent: 4943557 (1990-06-01), Ling
UNO et al., "Synthesis of Superconductive Oxides by Vacuum Calcination Method," Jap. Jrnl. App. Phys. vol. 27, No. 6, Jun. 1988 pp. L1003-L1006.
Iguchi et al., "Structural and Superconducting Properties of YBA.sub.2 Cu.sub.3 O.sub.7-0 Formed Under Oxygen Pressure Control," Jap. Jrnl. App. Phys. vol. 27, No. 6 Jun. 1988, pp. L992-L995.
Goretta et al., "Calcination of YBa.sub.2 Cu.sub.3 O.sub.7-x Powder", Materials Letters, vol. 7, No. 5,6, Nov. 1988.
McCallum et al., "Problems in the Production of YBa.sub.2 Cu.sub.3 O.sub.x, Superconducting Wire", Adv. Ceramic Materials, vol. 2, No. 3B, 1987.
Sherwood et al., "Superconducting Properties of YBa.sub.2 Cu.sub.3 O.sub.7-x Doped with Various Metals and Oxides", Mat. Res. Soc. Symp., Proc. vol. 99, Dec. 1987.
Balachandran et al., "Synthesis of Phase-Pure Orthorhombic YBa.sub.2 Cu.sub.3 O.sub.x Under Low Oxygen Pressure", Materials Letters, vol. 8, No. 11,12, Nov. 1989.
Balachandraw et al., "Synthesis of 80 K Superconducting YBa.sub.2 Cu.sub.4 O.sub.8 via a Novel Route".
Balachandran Uthamalingam
Emerson James E.
Johnson Stanley A.
Poeppel Roger B.
Anderson Thomas G.
Lieberman Paul
Moser William R.
Swope Bradley A.
The United States of America as represented by the United States
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