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

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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.

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Authors and Affiliations

  1. Instituto de Ciencia de Materiales, CSIC, Serrano 115 dpdo, 28006, Madrid, Spain

    P. Tartaj, J. Sanz, C. J. Serna & M. Ocaña

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  1. P. Tartaj
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  2. J. Sanz
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  3. C. J. Serna
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  4. M. Ocaña
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Tartaj, P., Sanz, J., Serna, C.J. et al. Zircon formation from amorphous spherical ZrSiO4 particles obtained by hydrolysis of aerosols. JOURNAL OF MATERIALS SCIENCE 29, 6533–6538 (1994). https://doi.org/10.1007/BF00354017

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  • DOI: https://doi.org/10.1007/BF00354017

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