Abstract
Nanocrystalline hafnium dioxide has been synthesized by hydrothermal treatment of X-ray amorphous hydrated hafnium dioxide in distilled water at 120–260°C for 1–7 days and in the presence of NaCl and NaOH as mineralizing agents. The size of HfO2 crystallites has been shown to be determined by the temperature of hydrothermal treatment and the type of mineralizing agent. The size of HfO2 crystallites obtained in alkaline medium is by 2–3 times smaller than that for HfO2 crystallites obtained in neutral medium and constitutes ~8 nm. Dispersing of nanocrystalline HfO2 obtained by hydrothermal treatment in water in the presence of dextrane and poly(vinylpyrrolidone) under exposure to ultrasound leads to preparation of stable sols of nanocrystalline HfO2.
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