Compositions: ceramic – Ceramic compositions – Yttrium – lanthanide – actinide – or transactinide containing
Patent
1988-08-19
1991-10-08
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Yttrium, lanthanide, actinide, or transactinide containing
264 28, 505 1, 505737, 505739, 505733, H01B 1200, H01L 3912, B05B 300, B29C 3502
Patent
active
050554360
ABSTRACT:
An improved process for preparing superconducting ceramic powder includes calcining superconducting precursor compounds in an atmosphere having a controlled amount of oxygen, generally not more than that found in air, the remainder of the atmosphere composed of a gas or mixture of gases inert with respect to the ceramic. A preferred process includes forming the precursor compounds into a slurry, granulating the slurry, drying the granules (a binder can be added to the slurry to promote green strength), and calcining in the controlled atmosphere to provide the desired HTSC (high temperature superconductor) composition.
REFERENCES:
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Beyers et al., "On the Relationship Between Processing, Structure, and Superconductivity in YDA.sub.2 Cu.sub.3 O.sub.g-x ", Extended Abstracts: High Temperature Superconductors, MRS Symposium (1987).
Uchida et al., "High Tc Superconductivity of LA-Br-Cu Oxides", (1986).
"Comparison of Carbonate Citrate and Oxalate Chemical Routes to the High-Tc Metal Oxide Superconductors LA.sub.2-x Si.sub.x CuO.sub.4 ", Inorganic Chemistry, (1987).
Geballe et al., "Some Thoughts on High Tc Perovskite Superconductors", MRS Symposium (1987).
K. W. Lay, "Formation of Yttrium Barium Cuprate Powder at Low Temperatures," J. Am. Ceram. Soc., vol. 72, No. 4, 696-698 (1989); see also General Electric Co. Technical Information Series of Same Name, No. 88CRD144 (May 1988).
International Search Report for PCT/US89/03561.
Halloran John W.
Hodge James D.
Klemptner Lori J.
Bonner Melissa
CPS Superconductor Corp.
Dixon Jr. William R.
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