Ceramics-Silikáty 37, (2) 93 - 96 (1993)

Preparation of powdered zirconia with monodisperse, submicron and spherical particles is based on precipitation of hydrated zirconium oxide from aqueous solutions of zirconate salts. Investigation of the effects of concentration of hexafluorozirconic acid, the pH, temperature and type of the basic component employed in the precipitation of hydrated oxides has revealed the optimum conditions for the formation of the types of particles of zirconium oxide, mentioned above, from solutions of hexafluorozirconic acid. The best results were obtained with precipitating hydrated zirconium oxide from 0.1M solution of H₂ZrF₆ with ammonium hydroxide at 20 °C and pH 11.