Direct Mechanochemical Synthesis of Nanocrystalline NiWO4

The possibilities of mechanochemical activation as a successful route for direct synthesis of NiWO 4 have been studied. A stoichiometric mixture of NiO and WO 3 in a 1:1 molar ratio was subjected to intense mechanical treatment in air using a planetary ball mill for different periods of time. The phase and structural transformations were monitored by X-ray diffraction (XRD), infrared spectroscopy (IR), and X-ray photoelectron spectroscopy (XPS). It was found that 7.5 h of milling of the reagents leads to complete crystallization of single nanostructured phase NiWO 4 at room temperature.