| Abstract
| - The aim of this work is to investigate the microstructure development of cerium oxidenanocrystal, prepared by the microemulsion process, as a function of annealing temperaturein air. Combined with the HRTEM and the thermogravimetric−differential thermal analysis(TG−DTA), the XRD patterns reveal that the sample annealed at 623 K is amorphous, andthe formation of cerium oxide nanocrystal occurs above 773 K. The local structural andelectronic properties in the nanocrystallization process are probed by X-ray absorption spectra(XAS) at the Ce L3 edge. It is found that the phase structure changes from triclinic to cubic(CeO2), and the electronic structure changes from Ce3+ to Ce4+ upon increasing the annealingtemperature.
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