Abstract
Nano-composites of CeO 2–CeAlO 3 are synthesised by solution combustion method employing (a) urea and (b) a mixture of urea and glycine as fuels with corresponding metal nitrates. The as-prepared powders are all nano-sized (5–30 nm) and the same is confirmed by broadening of the X-ray diffraction peaks and transmission electron microscopy. A starting composition of Ce:Al in the atomic ratio 4:6 gives rise to different phases depending on the fuel being used for combustion. When urea alone is used as fuel, nano-crystalline CeO 2 phase is formed with Al 2O 3 being in the amorphous state. When the mixture of fuels is used, a mixture of nano-sized CeO 2 and CeAlO 3 phases is obtained. However, upon sintering at 1400 ° C in air, the stable phases CeO 2 and α -Al 2O 3 are formed in both the cases. Combustion synthesis using mixture-of-fuels is proposed to be a route to stabilise low oxidation compounds such as CeAlO 3.
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