Particles of rare earth phosphate and method for the preparation

Details Particles of rare earth phosphate and method for the preparation Particles of rare earth phosphate and method for the preparation

1995-05-30

1996-10-22

Langel, Wayne

Chemistry of inorganic compounds

Rare earth compound

2523014P, C01F 1700

Patent

active

055674038

ABSTRACT:
Proposed is a method for the preparation of a rare earth phosphate powder or, in particular, a composite rare earth phosphate powder of lanthanum, cerium and terbium having properties suitable for use as a base material of phosphors in fluorescent lamps in respect of particle size distribution of 1-10 .mu.m and globular particle configuration. The method is basically a precipitation method by mixing aqueous solutions of a water-soluble salt of the rare earth element or elements and phosphoric acid but the inventive method is characterized by completing introduction of the rare earth salt solution into the phosphoric acid solution within a limited length of time of 3 seconds to 5 minutes at a specified temperature, each of the solutions having a specified concentration.

REFERENCES:
patent: 5340556 (1994-08-01), Collin et al.

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