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Synthesis and properties of nanocrystalline ceria powders

Published online by Cambridge University Press:  01 November 2004

S. Basu ,
P. Sujatha Devi  and
H.S. Maiti
S. Basu
Affiliation:
Electroceramics Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India
P. Sujatha Devi*
Affiliation:
Electroceramics Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India
H.S. Maiti
Affiliation:
Electroceramics Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Nanocrystalline CeO2 powder was synthesized by a citrate-nitrate autoignition process and characterized by thermal analysis, x-ray diffraction, and impedance spectroscopy measurements. Nanocrystalline (20–40 nm) ceria powder with fluorite structure had formed in situ during the citrate-nitrate autoignition process. The powder prepared could be sintered to density more than 98% of theoretical density at 1450 °C. The nanocrystalline CeO2 exhibited an increase in conductivity in Ar and H2 than air above 600 °C, suggesting a possible electronic contribution to the conductivity at low oxygen partial pressures. Impedance measurements on the sintered samples unequivocally established the potential of this process in developing phase pure ceria compositions.

Keywords

Electrical propertiesIonic conductorNanoparticle
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 11 , November 2004 , pp. 3162 - 3171
Copyright
Copyright © Materials Research Society 2004

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