Characterization and sintering of nanocrystalline CeO2 powders synthesized by a mimic alkoxide method

J. G. Li; T. Ikegami; J. H. Lee; T. Mori

doi:10.1016/S1359-6454(00)00327-X

Characterization and sintering of nanocrystalline CeO₂ powders synthesized by a mimic alkoxide method

J. G. Li, T. Ikegami, J. H. Lee, T. Mori

Research output: Contribution to journal › Article › peer-review

104 Citations (Scopus)

Abstract

Nanocrystalline CeO₂ powders of high sinterability have been successfully synthesized by a mimic alkoxide method, which employs alcohols as solvent, cerium nitrate hexahydrate as cerium source and diethylamine (DEA) as precipitant. Precipitation participating anions (OH^-) are generated via the hydrolysis of DEA with the molecular water of the cerium salt. Irrespective of solvent type, the precursors produced by this method are CeO₂·2H₂O, which completely dehydrates to CeO₂ at temperatures >500 °C. Calcining the precursors at 600 °C for 2 h yields highly reactive CeO₂ powders with average crystallite sizes of approximately 15 nm. These powders can be densified to >99% of the theoretical up to 1160 °C in air at a constant heating rate of 10 °C/min or to the same density by isothermal sintering at 1000 °C for 2 h. The effects of calcination temperature and solvent type on powder characteristics and sinterability are also investigated.

Original language	English
Pages (from-to)	419-426
Number of pages	8
Journal	Acta Materialia
Volume	49
Issue number	3
DOIs	https://doi.org/10.1016/S1359-6454(00)00327-X
Publication status	Published - 2001 Feb 8
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/S1359-6454(00)00327-X

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abstract = "Nanocrystalline CeO2 powders of high sinterability have been successfully synthesized by a mimic alkoxide method, which employs alcohols as solvent, cerium nitrate hexahydrate as cerium source and diethylamine (DEA) as precipitant. Precipitation participating anions (OH-) are generated via the hydrolysis of DEA with the molecular water of the cerium salt. Irrespective of solvent type, the precursors produced by this method are CeO2·2H2O, which completely dehydrates to CeO2 at temperatures >500 °C. Calcining the precursors at 600 °C for 2 h yields highly reactive CeO2 powders with average crystallite sizes of approximately 15 nm. These powders can be densified to >99% of the theoretical up to 1160 °C in air at a constant heating rate of 10 °C/min or to the same density by isothermal sintering at 1000 °C for 2 h. The effects of calcination temperature and solvent type on powder characteristics and sinterability are also investigated.",

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AU - Li, J. G.

AU - Ikegami, T.

AU - Lee, J. H.

AU - Mori, T.

PY - 2001/2/8

Y1 - 2001/2/8

N2 - Nanocrystalline CeO2 powders of high sinterability have been successfully synthesized by a mimic alkoxide method, which employs alcohols as solvent, cerium nitrate hexahydrate as cerium source and diethylamine (DEA) as precipitant. Precipitation participating anions (OH-) are generated via the hydrolysis of DEA with the molecular water of the cerium salt. Irrespective of solvent type, the precursors produced by this method are CeO2·2H2O, which completely dehydrates to CeO2 at temperatures >500 °C. Calcining the precursors at 600 °C for 2 h yields highly reactive CeO2 powders with average crystallite sizes of approximately 15 nm. These powders can be densified to >99% of the theoretical up to 1160 °C in air at a constant heating rate of 10 °C/min or to the same density by isothermal sintering at 1000 °C for 2 h. The effects of calcination temperature and solvent type on powder characteristics and sinterability are also investigated.

AB - Nanocrystalline CeO2 powders of high sinterability have been successfully synthesized by a mimic alkoxide method, which employs alcohols as solvent, cerium nitrate hexahydrate as cerium source and diethylamine (DEA) as precipitant. Precipitation participating anions (OH-) are generated via the hydrolysis of DEA with the molecular water of the cerium salt. Irrespective of solvent type, the precursors produced by this method are CeO2·2H2O, which completely dehydrates to CeO2 at temperatures >500 °C. Calcining the precursors at 600 °C for 2 h yields highly reactive CeO2 powders with average crystallite sizes of approximately 15 nm. These powders can be densified to >99% of the theoretical up to 1160 °C in air at a constant heating rate of 10 °C/min or to the same density by isothermal sintering at 1000 °C for 2 h. The effects of calcination temperature and solvent type on powder characteristics and sinterability are also investigated.

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Characterization and sintering of nanocrystalline CeO₂ powders synthesized by a mimic alkoxide method

Abstract

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