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- W2030607384 abstract "Nanocrystalline CeO2 particles were firstly prepared by two-stage non-isothermal precipitation, i.e. precipitating at 70 °C and aging at another temperature. Experimental results showed that the intermediates at the end of precipitation stage were needle-like mixtures of Ce3+–Ce4+ compounds. The subsequent aging temperature played an important role on the shape and size of final products. As the aging temperature suddenly reduced to 0 °C, the resultant particles retained their original needle-like structure via the topotactic mechanism, which cannot be obtained by isothermal precipitation. As raising the aging temperature above 50 °C, the products were hexagonal and grown up with increasing temperature via the dissolution–recrystallization mechanism. Moreover, all products were cubic-fluorite structured CeO2 with negligible Ce3+ content. As compared to the nanohexagons (aged at 90 °C), the nanoneedles (aged at 0 °C) exhibited an unordinary red shift in the UV absorption and possessed a smaller bandgap energy." @default.
- W2030607384 created "2016-06-24" @default.
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- W2030607384 date "2005-03-01" @default.
- W2030607384 modified "2023-10-18" @default.
- W2030607384 title "Synthesis and characterization of nanocrystalline cerium oxide powders by two-stage non-isothermal precipitation" @default.
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- W2030607384 doi "https://doi.org/10.1016/j.ssc.2004.12.020" @default.
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