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Figure 1
(a)–(d) Illustrations of the possible γ-Fe2O3 structural configurations and (e) the structure of Fe3O4. The black and white polyhedra represent tetrahedral [FeO4] and octahedral [FeO6] units, respectively. The red polyhedra highlight the partially occupied or unoccupied octahedral sites, illustrating the degree of vacancy ordering. The illustrations have been made using the structure-visualization software VESTA (Momma & Izumi, 2011BB52).

IUCrJ
Volume 8| Part 1| January 2021| Pages 33-45
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520013585