Abstract: The NiFe₂O₄-10NiO powder for inert anode of aluminium electrolysis was prepared by high temperature solid state reaction. The microstructural evolution from the raw materials NiO and Fe₂O₃ to the NiFe₂O₄-10NiO powder was studied by SEM. The results show that the domain structure making up of the agglomerate particles of Fe₂O₃ remains after high temperature solid state reaction, and the diffusion of Ni²⁺ into Fe₂O₃ structure is the control step of the reaction process. A microstructure with compact structure and fine grain inside the particle results from the sintering of NiFe₂O₄-10NiO powder.

Key words: high temperature solid state reaction; NiFe₂O₄-NiO; microstructural evolution; inert anode