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The effect of thermal decomposition conditions on the powder properties of Fe3O4 has been investigated, in order to obtain fine Fe3O4 powder. It is shown that the one phase Fe3O4 could be obtained under the following conditions, water vapor pressure is 0.1MPa, and thermal decomposition temperature is between 550 and 800°C. Fine Fe3O4 powder could be obtained by introducing FeCls or O2 at the thermal decomposition of FeCl2. It was found that FeO was not formed when FeCl3 was introduced.

Magnetite Formation by Thermal Decomposition of FeCl2.