Mechanochemical synthesis of nanocrystalline nickel molybdates

Mechanochemical synthesis of nanocrystalline ZnWO4 at room temperature

“…Both vials and balls were of stainless steel. The balls to powder weight ratio was 10:1 which was established as appropriate in our previous studies [46,47]. The synthesis of ZnWO4 was carried out at four different milling conditions varying in milling speed and balls diameter: The phase and structural transformations were monitored by X-ray diffraction (XRD) and infrared spectroscopy (IR).…”

“…The many factors as milling speed, time of activation, diameter of balls, balls to powder weight ratio influence on the mechanochemical synthesis. Our previous results showed that mechanochemical treatment of NiO and MoO 3 and NiO and WO 3 led to direct synthesis of NiMoO 4 and NiWO 4 at room temperature [46,47]. This motivated us to continue to use pure oxides during mechanochemical treatment for the synthesis of compounds from the same groups as AWO 4 .…”

Synthesis of ZrMo2O8 polymorphs by a melt quenching method and mechanochemical activation

“…7). The balls to powder weight ratio was 10:1, which was chosen following our studies [31,32]. Both container and balls were made of stainless steel.…”

“…Up to now mechanochemical activation and the melt quenching method have not been applied to the synthesis of this compound but our preliminarily results have shown that the mechanochemical treatment is appropriate for the synthesis of trigonal (␣) ZrMo 2 O 8 [28]. Mechanochemical activation is widespread in the synthesis of different solid state materials because very often it leads to a decrease in time and temperature needed to obtain the final products [29][30][31][32]. The other selected method based on melt quenching is appropriate for the preparation of metastable or amorphous phases for a short time and production of glass ceramics [33][34][35][36].…”

Polyol‐Mediated Synthesis and Properties of Nanoscale Molybdates/Tungstates: Color, Luminescence, Catalysis

“…Most often nanoscale molybdates and tungstates have been gained via simple water-based precipitation, [ 3 ] freeze-drying, [ 8 ] hydrothermal/solvothermal reactions, [ 9 ] thermal combustion, [ 10 ] or mechanochemical treatment. [ 11 ] Quite often the described materials were obtained with comparably large diameter (i.e., greater than 80 nm), and broad size distribution. Moreover, molybdate/tungstate nanoparticles have been incorporated into zeolithe frameworks or instantaneously agglomerated to form porous matrices.…”