The influence of the preparation methods on the properties of SnO2 and ZrO2 powders, especially the specific surface area and the stability upon calcination was investigated. SnO2 and ZrO2 prepared by chemical precipitation using reflux-digestion process with NaOH possess high surface area at the calcination temperature of 500℃～1000℃. A novel solvothermal process in the presence of urea was used to synthesize nanocrystalline SnO2 powders excluding the adulteration of Si. As increasing the concentration of urea, the grain size of the as-prepared powders reduced and the surface area increased.SnO2 nanocrystals with a grain size of ca. 1 nm and a high surface area of 331 m2g-1 were obtained by this method. These high-surface-area powders are favorable for gas-sensing and catalysis applications, and the development of an advanced material for structural engineering ceramics.
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