Ultrafine ceria powders via glycine-nitrate combustion

The ultrafine ceria powders have been synthesized by the combustion technique using glycine as a fuel and nitrate as an oxidizer. The auto-ignition (at ≈200°C) of the viscous liquids containing cerium nitrate and glycine resulted in voluminous ceria powders. An interpretation based on an adiabatic f...

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Bibliographic Details
Published in:Materials research bulletin 2001-12, Vol.36 (15), p.2711-2721
Main Authors: Purohit, R.D, Sharma, B.P, Pillai, K.T, Tyagi, A.K
Format: Article
Language:English
Subjects:
A. Nanostructure
B. Chemical synthesis
C. Electron microscopy
C. X-ray diffraction
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Powders
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Summary:The ultrafine ceria powders have been synthesized by the combustion technique using glycine as a fuel and nitrate as an oxidizer. The auto-ignition (at ≈200°C) of the viscous liquids containing cerium nitrate and glycine resulted in voluminous ceria powders. An interpretation based on an adiabatic flame temperature, for different fuel-to-oxidant ratios, has been proposed for the nature of combustion and its correlation with the powder characteristics. The combustion synthesized ceria powders have been characterized by XRD, HRTEM, surface area analysis, and sinterability. Specific surface area and primary crystallite size of the ceria powder obtained through fuel-deficient precursor was found to be ≈75 m 2/g and 2.5–12 nm, respectively. The powder, when cold pressed and sintered in air at 1250°C for 1 h, attained the sintered density ≈94% of its theoretical density, with submicron grain size.
ISSN:0025-5408
1873-4227
DOI:10.1016/S0025-5408(01)00762-0