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Reactive Cerium(IV) Oxide Powders by the Homogeneous Precipitation Method
Author(s) -
Chen PeiLin,
Chen IWei
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03942.x
Subject(s) - calcination , crystallite , materials science , hexamethylenetetramine , precipitation , cerium oxide , cerium , chemical engineering , cerium nitrate , oxide , particle size , mineralogy , metallurgy , inorganic chemistry , chemistry , catalysis , biochemistry , physics , meteorology , engineering
CeO 2 powders have been prepared by aging a cerium(III) nitrate solution in the presence of hexamethylenetetramine. Oxidation of Ce 3+ occurs in the precipitate and the wet precipitate is identified as crystallized CeO 2 before any heat treatment. The cold‐pressed powders can be sintered to full density at temperatures as low as 1250°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 Å have a sinterability as good as the powders calcined at 450°C with a crystallite size of 145 Å. The mechanisms for direct CeO 2 precipitation and its relation to the excellent sinterability are discussed.