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The rare earth-iron mixed oxide (REFeO 3 ) is an attractive material in fields such as electronic, magnetic, and catalytic research. Generally, orthorhombic REFeO 3  ( o -REFeO 3 ) with a perovskite structure is better known than hexagonal REFeO 3  ( h -REFeO 3 ), because  o- REFeO 3  is thermodynamically stable for all RE elements. However,  h -REFeO 3  has a very interesting crystal structure in which a RE and Fe layer are alternately stacked along the  c -axis in the unit cell; nevertheless, synthesis of the  h -REFeO 3  belonging to metastable phase can be problematic. Fortunately, solution-based synthetic methods like solvothermal or coprecipitation synthesis have recently enabled the selective synthesis of  h -REFeO 3  and  o -REFeO 3  with comparative ease. Although the electronic and magnetic properties of  h -REFeO 3  have typically been evaluated, recent research has also revealed excellent catalytic properties that enable environmental cleanup reactions such as hydrocarbon or CO oxidation. This mini-review introduces a synthetic method for controlling the crystal structure between orthorhombic and hexagonal REFeO 3  and the catalytic performance of  h -REFeO 3 -based materials.

Hexagonal Rare Earth-Iron Mixed Oxides (REFeO3): Crystal Structure, Synthesis, and Catalytic Properties