Synthesis and characterization of nanocrystalline cerium oxide powders by two-stage non-isothermal precipitation

  • Chen H
  • Chang H
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Abstract

Nanocrystalline CeO2particles 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 CeO2with 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. © 2004 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • A. Nanostructures
  • B. Precipitation
  • C. Cerium oxide

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Authors

  • Huey Ing Chen

  • Hung Yi Chang

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