Ultrafine ceria powders via glycine-nitrate combustion

• Published in: Materials research bulletin Vol. 36; no. 15; pp. 2711 - 2721
• Main Authors: Purohit, R.D, Sharma, B.P, Pillai, K.T, Tyagi, A.K
• Format: Journal Article
• Language: English
• Published: London Elsevier Ltd 01.12.2001; Amsterdam Elsevier Science
• 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; B. Chemical synthesis; C. Electron microscopy; A. Nanostructure; C. X-ray diffraction; Cerium Oxides; Binary compound; High resolution; Combustion; Nanostructure; Nitrates; Glycine; X ray diffraction; Ultrafine powder; Transmission electron microscopy; Preparation; Autoignition; Lanthanide Compounds; Flame
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/S0025-5408(01)00762-0

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.