Each of the  four different known  crystalline Fe2O3 polymorphs (alpha, beta, gamma, and epsilon-Fe2O3) has unique biochemical, magnetic, catalytic, and other properties that make it suitable for specific technical and biomedical applications.  High temperature treatment is a key step in most syntheses of iron(III) oxides, but often  induces polymorphous transformations that result in the formation of undesired mixtures of  Fe2O3 polymorphs. It is therefore important to control the parameters that induce  polymorphous transformations when finding routes to prepare  a given Fe2O3 polymorph as a single phase. The dependence of the mechanism and kinetics of the polymorphous transformations of Fe2O3 on the  intrinsic properties of the material and external parameters of synthetic and/or natural conditions such as  temperature, atmosphere, and  pressure are discussed. In addition, the question of whether different  Fe2O3 polymorphs are formed sequentially or simultaneously  during thermal processes is discussed.

Polymorphous transitions of nanometric Fe<sub>2</sub>O<sub>3</sub>

243rd National Meeting (2012)

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Polymorphous transitions of nanometric Fe2O3

Polymorphous transitions of nanometric Fe₂O₃