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Abstract: Highly dispersed perovskite NdCoO3 nanoparticles with an average particle size of about 9 nm have been successfully prepared by a novel salt-assisted combustion process. The effects of NaCl content and calcination temperature on the characteristics of the products were investigated by XRD, TEM and BET nitrogen adsorption. The facile introduction of NaCl in the conventional combustion synthesis process was found to result in the formation of well-dispersed perovskite nanoparticles and increase specific surface area of the resultants from 1.70 to 43.22 m2·g−1. A mechanism scheme was proposed to illustrate the possible formation processes. [Copyright &y& Elsevier]

Abstract: Nanocrystalline ceria-based powders [CeO2, (YO1.5)0.2(CeO2)1.8, (NdO1.5)0.2(CeO2)1.8, (SmO1.5)0.2(CeO2)1.8, (GdO1.5)0.2(CeO2)1.8] have been prepared using combustion synthesis with ethylene glycol as a novel fuel and nitrate as an oxider. 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 pure CeO2 powders synthesized by using different ethylene glycol–nitrate ratios have been characterized by X-ray diffractionmetry, transmission electron microscopy and infrared spectroscopy. The effects of calcination temperature and doping on the as-synthesized powders have been investigated by XRD. [Copyright &y& Elsevier]