Journal of Materials Science

, Volume 29, Issue 24, pp 6533–6538 | Cite as

Zircon formation from amorphous spherical ZrSiO4 particles obtained by hydrolysis of aerosols

  • P. Tartaj
  • J. Sanz
  • C. J. Serna
  • M. Ocaña
Papers

Abstract

A procedure for the preparation of SiO2·ZrO2 spherical particles, based on the hydrolysis of liquid aerosols is described. A mixture of tetraethylortho-silicate (TEOS) and zirconium n-propoxide with the proper stoichiometry (Zr/Si atomic ratio = 1) was used as a liquid precursor. The alkoxide mixture had to be partially hydrolysed before aerosol generation in order to obtain solids with a zircon composition. The as-prepared powders consisted of particles in the micrometre range with an amorphous character. Energy dispersive X-ray spectroscopy (EDX), infrared (i.r.) and nuclear magnetic resonance (NMR) analyses indicated the existence of a good compositional homogeneity and a large number of Si-O-Zr bonds in the sample. Calcination of the powder up to 950°C gave rise to the segregation of silica and the crystallization of tetragonal zirconia, which transformed into the monoclinic phase after heating at 1300°C. Crystallization of zircon started on calcination at 1450°C; it was accompanied by the formation of some cristobalite. The complete transformation of the sample into zircon took place after prolonged heating (20 h) at 1500°C.

Keywords

Zircon Nuclear Magnetic Resonance Cristobalite ZrSiO4 Tetragonal Zirconia 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • P. Tartaj
    • 1
  • J. Sanz
    • 1
  • C. J. Serna
    • 1
  • M. Ocaña
    • 1
  1. 1.Instituto de Ciencia de MaterialesCSICMadridSpain

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