Comparative study of nanocrystalline zirconia prepared by precipitation and sol-gel methods

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Abstract

The crystalline properties of zirconia synthesized by the precipitation and sol-gel methods were comparatively studied. Samples were characterized with thermoanalysis and X-ray powder diffraction techniques. The tetragonal and monoclinic crystalline structures of zirconia were refined with the Rietveld technique, which provided the quantitative information concerning the lattice cell parameters, phase concentrations, average crystallite sizes and the concentrations of the cationic and anionic vacancies. Both synthesis methods gave rise to nanocrystalline zirconia. The samples calcined at 800°C and prepared by the precipitation had average crystallite sizes less than 18 nm, which were two times smaller than the corresponding values obtained in the sol-gel samples. Both tetragonal and monoclinic nanocrystalline phases had atomic defects in concentrations that depended on the synthesis method and annealing temperature.

Original languageEnglish
Pages (from-to)21-30
Number of pages10
JournalCatalysis Today
Volume68
Issue number1-3
DOIs
StatePublished - 1 Jul 2001

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Keywords

  • Lattice vacancies
  • Nanocrystalline zirconia
  • Precipitation synthesis
  • Sol-gel synthesis
  • Zirconia crystalline structure refinement

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