Abstract
The article investigates the influence of the reduction modes of hollow nickel oxide microspheres synthesized by the pyrolysis of ultrasonic aerosols on the ratio of the oxide and metallic forms of nickel in their structure. The synthesis of microspheres from an aerosol of an aqueous solution of nickel nitrate was carried out; their composition and morphology were studied. The reduction of microspheres was carried out in a stream of hydrogen at different temperatures. The ratio of metallic nickel and oxide was determined by two different methods: according to the data of thermogravimetric analysis and by the Rietveld method based on the results of x-ray phase analysis. It is shown that the proportion of metallic nickel increases with an increase in the reduction temperature to approximately 375°C and then changes insignificantly. The fractional composition of microspheres was determined.
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