Elucidation of mechanisms involved during silica reduction on silicon powders

► Chemical mechanism involved during the reduction of the silica on silicon powder is studied. ► The experimental transition temperature is consistent with thermochemical calculations. ► The measured weight loss is consistent with the mass balance of the reaction. ► The thickness of the silica layer at the powder surface is measured. ► The diffusion through the silica layer does not limit the reduction kinetics above 1000 °C.