Fractal structure of ceria nanopowders

Moscow State University, Vorob’evy gory 1, Moscow, 119899 Russia
Inorganic Materials (Impact Factor: 0.56). 04/2008; 44(3):272-277. DOI: 10.1134/S0020168508030114


The formation of ceria nanoparticles from water-alcohol solutions of cerium(III) nitrate has been studied by UV/VIS spectroscopy,
low-temperature nitrogen adsorption measurements, x-ray diffraction, transmission electron microscopy, and thermal analysis,
and the effect of high-temperature annealing on the fractal structure of the CeO2 nanopowders has been examined.

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    ABSTRACT: Cerium dioxide (CeO2) has special electrical and optical properties, and chemical and thermal stability. It has been used in semiconductor devices and as a luminescent material. In this work, CeO2 nanoparticles were synthesized by the precipitation method and the product annealed at various temperatures. Thermogravimetric analysis (TGA)/differential scanning calorimetry (DSC) results show that the optimum annealing temperature for fabrication of CeO2 nanoparticles is greater than 500°C. When the calcination temperature is increased from 550°C to 1050°C, Fourier-transform infrared (FTIR) results show that the water and impurities are almost completely removed, after calcination at 750°C. The x-ray diffraction (XRD) results suggest that the synthesized CeO2 exhibits a cubic fluorite structure. The crystallite size of the CeO2 increases from 8 nm to 75 nm when the calcination temperature is increased from 550°C to 1050°C. The absorption spectrum in the ultraviolet (UV) region from 372 nm to 395 nm demonstrates their applicability as UV-filter materials, and the shift of the estimated E g,eff from 3.21 eV to 3.65 eV demonstrates their applicability in photoelectric devices. CeO2 would be potentially important for applications such as insulator structures, stable capacitor devices, and light-emitting diodes (LEDs).
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    ABSTRACT: Ceria nanoparticles (D = 2.4−6.9 nm) with the fluorite structure have been prepared via oxidative precipitation of cerium from a solution of a rare-earth chloride mixture, followed by acid washing.
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    ABSTRACT: Particle coarsening trends at high temperatures (200 to 700 °C) in CeO2 nanoparticles having various chemical histories are determined by powder X-ray diffraction (XRD), low-temperature nitrogen adsorption, transmission electron microscopy, and small-angle neutron scattering (SANS). Intergrowth of individual CeO2 crystallites is the main scenario of nanoparticle coarsening.
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