Reactive cerium(IV) oxide powders by the homogeneous precipitation method

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb03942.x· OSTI ID:6402691

Chen, Peilin; Chen, Iwei ^[1]

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1. Univ. of Michigan, Ann Arbor (United States)

CeO[sub 2] powders have been prepared by aging a cerium (III) nitrate solution in the presence of hexamethylenetetramine. Oxidation of Ce[sup 3+] occurs in the precipitate and the wet precipitate is identified as crystallized CeO[sub 2] before any heat treatment. The cold-pressed powders can be sintered to full density at temperatures as low as 1,250 C in just 6 min. Moreover, the sinterability of the powders is insensitive to the calcination temperatures, particle size, or green density. The powders calcined at 850 C with a crystallite size of 600 [angstrom] have a sinterability as good as the powders calcined at 450 C with a crystallite size of 145 [angstrom]. The mechanisms for direct CeO[sub 2] precipitation and its relation to the excellent sinterability are discussed.

• DOE Contract Number: FG02-87ER45302
• OSTI ID: 6402691
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 76:6; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM OXIDES
CHEMICAL PREPARATION
SINTERING
HEAT TREATMENTS
OXIDATION
POWDERS
PRECIPITATION
CERIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
FABRICATION
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SEPARATION PROCESSES
SYNTHESIS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication