Method for the preparation of spherical particles of a rare eart

Details Method for the preparation of spherical particles of a rare eart Method for the preparation of spherical particles of a rare eart

1994-02-22

1995-05-16

Langel, Wayne

Chemistry of inorganic compounds

Rare earth compound

2523014P, C09K 1108, C01F 1700

Patent

active

054158516

ABSTRACT:
A precipitation method is proposed for the preparation of a rare earth phosphate powder by the reaction of a water-soluble salt of the rare earth element in an aqueous solution with an ammonium phosphate, which gives a rare earth phosphate powder consisting of non-agglomerate discrete particles having a spherical particle configuration suitable as a base material of rare earth-based phosphors. The method is characterized by the addition of the ammonium phosphate in the form of a powder to an acidic aqueous solution of the rare earth salt under specified conditions in contrast to the conventional method in which the ammonium phosphate is admixed in the form of an aqueous solution.

REFERENCES:
patent: 5091110 (1992-02-01), Fan et al.
patent: 5314641 (1994-05-01), Collin et al.
patent: 5340556 (1994-08-01), Collin et al.
Derwent Abstracts, Abstract of JP-92-196924, "Rare Earth Metal Phosphate(s) Manufactured for Fluorescent Lamps by Spray Drying Metal Phosphate Slurry Containing Activator to Form Green Spheres", May 1, 1992.
Patent Abstracts of Japan, Abstract of JP-4,130,014, "Production of Rare Earth Phosphate", May 1, 1992.

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