Preparation of powdery solid

Reacting the one or more oxidizable and / or hydrolysable metal compound in the presence of oxygen and / or water vapor in the hot zone, the reaction mixture was cooled after the reaction, to remove the powdered solid from a gaseous material powder in Jo solid production process, introducing at least one metal compound in solid form to the hot zone, the method of this time, characterized in that the evaporation temperature of the metal compound is below the temperature of the hot zone.