Process for preparing crystalline ceric oxide

Details Process for preparing crystalline ceric oxide Process for preparing crystalline ceric oxide

1995-06-15

1996-08-06

Langel, Wayne

Chemistry of inorganic compounds

Rare earth compound

252352, C01F 1700

Patent

active

055431267

ABSTRACT:
The present invention is to provide a process for preparing ceric oxide particles used as an abrasive or polishing material for producing semiconductors or as a UV ray-absorbing material for plastics, glass and the like.
The present invention relates to a process for preparing cerium (IV) oxide particles having a particle size of from 0.03 .mu.m to 5 .mu.m, which comprises adjusting an aqueous medium containing cerium (IV) hydroxide and a nitrate to a pH of from 8 to 11 with an alkaline substance and heating the aqueous medium at a temperature of from 100.degree. to 200.degree. C. under pressure.

REFERENCES:
patent: 4965057 (1990-10-01), David et al.
patent: 5389352 (1995-02-01), Wang
patent: 5433878 (1995-07-01), Arai et al.

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