Abstract
“Glass-like” transparent zirconia gel prepared by controlled hydrolysis of zirconium propoxide was substantially freed from organics by treatment with hydrogen peroxide and, subsequently, subjected to heat treatment at temperatures ranging from 300 to 800 °C. The heat treated gel was characterized for its color, crystallinity and crystallite size. The crystallization behavior of the gel was investigated by X-ray diffraction analysis and infrared spectroscopy. The results showed that the gel heated at 400 °C contained purely the tetragonal phase, above 400 °C a mixture of tetragonal and monoclinic phases was present, wheras at 800 °C only the monoclinic phase was present. The mean average crystallite size after heat treatment in the 400 to 800 °C temperature range was of the order of 115 A. It has been suggested that appearance of the tetragonal phase during heat treatment of the gel at low temperatures might be related to its molecular structural configuration and crystal growth characteristics to the presence of porosity in the gel structure.
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