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Possible structures produced during the synthesis of IrRu catalyst. Unit cells are shown within each structure. (A) Rutile ATO, space group P42/mnm.38 (B) Metallic iridium, space group Fm3̅m.39 (C) Metallic ruthenium, space group P63/mmc.40 (D) Rutile iridium oxide, space group P42/mnm.41 (E) Hollandite iridium oxide, space group I4/m.42,43 Figures were made with Mercury 2021.2.044 and Adobe Illustrator.
