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All the reagents were of analytical grade and were used without further purification. In a typical synthetic procedure of CeO2 spherical crystallites, 5 mmol of Ce(NO3)3â6H2O and 10 mmol of PVP (repeating units) were dissolved in 40 mL of distilled water and stirred magnetically for 30 min to get good homogeneity. The resulting solution was transferred into a 50 mL Teflon-lined stainless steel autoclave. The autoclave was maintained at 140 °C for 24 h. After cooling to room temperature naturally, the light-yellow precipitates were filtered off, washed with distilled water and anhydrous alcohol several times, and dried in a vacuum at 80 °C for 12 h. X-ray diffraction patterns were recorded by using a Philiphs X’Pert Super diffractometer with graphite monochromatized Cu Ka radiation (1.541 78 ) in the 2õ range of 10°-80°. The morphology of the products was examined by a scanning electron microscope (SEM) using an X-650 microanalyzer. FESEM images were taken on a field emission scanning electron microscope (JEOL JSM-6300F, 15 kV). Transmission electron microscopic (TEM) images were produced with a Hitachi 800 transmission electron microscope with the accelerating voltage of 200 kV. The samples used for characterization were dispersed in absolute ethanol and were ultrasonicated before SEM, FESEM, and TEM tests. [ Last edited by lsoul24517 on 2010-4-30 at 20:30 ] |
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