Investigation of the impact of mechanical activation on synthesis of the MgO-TiO2 system

In this study, a mixture of magnesium oxide and titanium dioxide was mechanically activated in order to investigate the possibility mechanochemical synthesis titanate. Mechanical activation performed for 1000 min high-energy vibro mill (type MH954/3, KHD Humboldt Wedag AG, Germany). The is equipped with housing having horizontally placed shutter. cylindrical stainless steel working vessel, inner dimensions 40 mm height 170 diameter, has elements consisting two free concentric rings total weight 3 kg. engine power 0.8 kW. Respecting optimal amount powder be 50-150 g stoichiometric ratio reactants equation presenting chemical reaction titanate synthesis, starting amounts were 20.2 (0.5 mol) MgO 39.9 TiO2. During experiments, X-ray diffraction analysis samples taken from system after 60, 180, 330, mechanical performed. Atomic absorption spectrophotometry used composition at different times. Based on results, it can concluded that greatest changes took place very beginning due disturbance crystal structure initial components. sample showed complete amorphization mixture, but maxima characteristic not identified. Therefore, experiments stopped. Evidently, energy input sufficient overcome barrier form new compound - failure synthesize explained by low negative Gibbs value -25.8 kJ/mol (despite theoretical will happen), as well entered into during which insufficient obtain product. Although MgTiO3 achieved, significant results obtained identify models further investigations reactions alkaline earth metals dioxide.