Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1993-08-02
1994-12-27
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501152, 501123, 423263, 423593, 505401, 505444, 505441, 505445, C04B 3550
Patent
active
053765940
ABSTRACT:
Process for preparing a high temperature superconductor such as yttrium bum copper oxides, by dissolving suitable proportions of hydrolyzable salts, oxides, or organometallic compounds of yttrium, barium and copper in an acid pH-controlled water-containing organic solvent such as methanol, and subjecting the resulting solution to ultrasonic energy or to an oxidation-reduction reaction, preferably while passing oxygen under a positive pressure through the solution, and precipitating a hydrolyzed precursor material. Such precursor material is then heated or annealed at temperatures between about 300.degree. C. and about 600.degree. C., also preferably in the presence of flowing oxygen, to produce the desired high temperature superconductor material.
REFERENCES:
patent: 4324576 (1982-04-01), Matsuyama et al.
patent: 4588575 (1986-05-01), David
patent: 5135907 (1992-08-01), Mazdiyas et al.
Bell Mark L.
Bonner C. M.
Forrest, Jr. John L.
Gilbert Harvey A.
Sliwka Melvin J.
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