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Л. М. Рудковская, Р. Н. Пшеничный, Т. В. Павленко, А. А. Омельчук
«Наноструктурный диоксид циркония, синтезированный гидротермальным методом из продуктов разложения цирконового концентрата »
351–360 (2012)

PACS numbers: 61.05.cp, 61.46.Hk, 61.72.Ff, 81.07.Bc, 81.07.Wx, 81.20.Fw, 81.16.Be

Hydrothermal synthesis of nanostructured zirconia powders from zircon-concentrate decomposition products with alkaline solutions of different concentration in the presence of calcium fluoride is developed. The effects of chemical prehistory (phase composition of zircon-concentrate decomposition products), the method for the preparation of initial zirconium-hydroxide gel, and hydrothermal-synthesis parameters on the morphology and microstructure of the obtained nanocrystalline zirconia powders are established. The optimal synthesis conditions are determined. As found, the zirconium hydroxide obtained from dissolved zircon-decomposition products with preliminary separation of silicic acid crystallizes under hydrothermal conditions mainly as monoclinic zirconia modification. However, if zirconium-hydroxide precipitates from acid solutions of decomposition products without separation of silicic acid, mainly the tetragonal form of zirconia crystallizes from such hydroxides. The nanocrystalline zirconia samples obtained are investigated by means of both x-ray phase analysis (XPA) and electron microscopy.