Combustion Synthesis and Characterization of Nanocrystalline CeO₂-Based Powders

Abstract

Nanocrystalline cerium oxide based powders (CeO2, (GdO1.5)0.2(CeO2)0.8, and (SmO1.5)0.2(CeO2)0.8) have been produced using combustion synthesis with glycine as fuel and nitrate as oxidizer. The pure CeO2 powders prepared by using different glycine-to-nitrate ratios have been characterized by X-ray diffraction (crystallite size), thermogravimetry, infrared spectroscopy, surface area analysis, and transmission electron microscopy. The influence of calcination temperature on crystallite size, surface area, and carbonate species remaining from the combustion reaction has been studied especially for the near stoichiometric glycine/nitrate ratio (G/N = 0.55) to reveal the optimal synthesis conditions for all three compositions. A G/N ratio of 0.55 and calcination at 550 °C in oxygen flow gave high quality powder with a crystallite size of ∼10 nm. The powders had excellent sintering properties with an onset of densification at ∼600 °C.

Investigation of strong shock wave interactions with CeO2 ceramic

“…The wide peak at 3000-3600 cm 1 range corresponds to -OH vibration band of H 2 O present in the compound. The peaks around 3393 cm 1 and 1623 cm 1 are attributed to the O-H stretching and bending vibrations, respectively, and are in comparison with the literature [25,26]. There are shifts in O-H frequencies at 1623 cm 1 and 3393 cm 1 towards higher wavelength region after interaction with O 2 .…”

Structural studies and luminescence properties of CeO2:Eu3+ nanophosphors synthesized by oxalate precursor method

“…The broad and weak band around 3,300 cm -1 is attributed to the physiosorbed water molecules present in the material. (Mokkelbost et al 2004). …”

Solution combustion synthesis using furfuryl alcohol as fuel and a combustible solvent

“…Fuels used in SCS include glycine, [11,12] urea/thiourea, [13,14] citric acid, [15]hydrazine, [16,17] and carbohydrates. [18,19] So far, water has been considered as the dispersing media and water-soluble fuels have been used exclusively.…”