Reaction kinetics of MgF2 powder in air at high temperature

The reaction kinetics of MgF2 powder in air at 750-1050 °C was investigated by using TG, XRD, SEM and EDS techniques. The results show that the reaction of MgF2 in air started at 800 °C and the porous MgO was formed on the surface of MgF2. At temperatures higher than 800 °C, the rate of the reaction increased significantly with increasing temperature, producing more porous MgO product. The reaction was caused by the reaction of MgF2 with water vapor in the air, which was controlled by the interface chemical reaction. The apparent activation energy of the reaction was measured.