Method for the preparation of coprecipitated carbonate of lantha

Details Method for the preparation of coprecipitated carbonate of lantha Method for the preparation of coprecipitated carbonate of lantha

1993-12-09

1994-10-04

Cooper, Jack

Chemistry of inorganic compounds

Rare earth compound

2523014P, 4234202, C01F 1700

Patent

active

053524268

ABSTRACT:
An improved method is proposed for the preparation of a composite carbonate powder of lanthanum, cerium and terbium as a base material of a green-emitting phosphor for which the carbonate powder is desired to have a uniform particle size distribution and a particle configuration as close to spherical as possible. The improved method is characterized by two-step heat treatment of the carbonate slurry formed by the addition of, for example, ammonium hydrogen carbonate to a mixed aqueous solution of lanthanum, cerium and terbium nitrates each under specified conditions while the pH of the aqueous slurry is adjusted to 5.0 to 7.5 after the first step heat treatment but before the second step heat treatment.

REFERENCES:
patent: 4263164 (1981-04-01), Swinkels et al.
patent: 4423349 (1983-12-01), Nakajima et al.
patent: 4497785 (1985-02-01), Tilley et al.
patent: 5015452 (1991-05-01), Matijevic
patent: 5045289 (1991-09-01), Fernando et al.
Nagashima et al "Bull. Chem. Soc. Japan", vol. 46, pp. 152-156, 1973.

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