Method for the preparation of globular particles of a rare earth

Details Method for the preparation of globular particles of a rare earth Method for the preparation of globular particles of a rare earth

1995-09-18

1996-08-13

Langel, Wayne

Chemistry of inorganic compounds

Rare earth compound

C01F 1700

Patent

active

055453864

ABSTRACT:
Proposed is a method for the preparation of a rare earth oxide powder consisting of particles having a globular particle configuration to be suitable as a base material of phosphors. The method comprises the steps of mixing an aqueous solution of a rare earth salt and an aqueous alkaline solution, e.g., ammonia water, to precipitate a rare earth hydroxide which is collected, washed with water and calcined to be converted into the oxide powder. Characteristically, the precipitation reaction of the rare earth hydroxide is carried out in the presence of a nitrogen-containing chelating agent such as triethanolamine in the aqueous medium in a controlled amount.

REFERENCES:
patent: 4778671 (1988-10-01), Wusirika
patent: 5196388 (1993-03-01), Shyu
Journal of Materials Science Letters, Jun. 1, 1992, No. 11, London, GB.

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