Compositions – Inorganic luminescent compositions – Tungsten containing
Patent
1993-09-13
1994-11-15
King, Roy V.
Compositions
Inorganic luminescent compositions
Tungsten containing
252521, 423593, C09K 330
Patent
active
053645626
ABSTRACT:
A process for preparing an insulating powder. In the first step of this process, a solution comprising a first compound (which preferably is an yttrium compound), a barium compound, and a copper compound subjected to ultrasonic sound waves at a frequency in excess of 20,000 hertz, and to a substantially atmospheric pressure of at least about 600 millimeters of mercury to cause such solution to form into an aerosol. Thereafter, a plasma is generated within a radio-frequency plasma reactor, and the aerosol is contacted with the plasma gas within the reactor while subjecting said aerosol to a substantially atmospheric pressure of at least about 600 millimeters of mercury and to a radio frequency alternating current at a frequency of from about 100 kilohertz to about to about 30 megahertz to form a vapor, which is thereafter flowed downwardly onto and collected on a collector.
REFERENCES:
patent: 5160664 (1992-11-01), Liu
Tohge et al, "Direct preparation of fine powders of the 80K superconducting phase in the Bi--Ca--Sr--Cu--O system by spray pyrolysis", Jpn. J. Appl. Phys. 28(7) Jul., 1989 pp. L1175-L1178.
Kodas et al, "Aerosol flow reactor production of fine YiBa.sub.2 Cu.sub.3 O.sub.7 powder: Fabrication of superconducting ceramics", Appl. Phys. Lett. 52(19) May 1988, pp. 1622-1624.
Gangopadhyay et al, Physica C, vol. 201, pp. 6-12 (1992).
Greenwald Howard J.
King Roy V.
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