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oai:figshare.com:article/34040628 2026-10-01T07:12:59Z category_1 category_4 category_146 category_8 category_16 category_24 category_873 category_62 portal_63 item_type_6 month_year_10_2026

Conditions and Mechanism for the Formation of CeFeO₃ via Hydrogen Reduction of CeO₂–Fe₂O₃ Mixed Oxides Masahiro Fujisaki (25153794) Sota Fukudome (25153797) Yo Hoshimori (25153800) Hiroyuki Yamaura (25153803) Syuhei Yamaguchi (2025271) Hiroyuki Setoyama (10149938) Rie Suizu (1578745) Hidenori Yahiro (4875631) Biophysics Biochemistry Space Science Microbiology Physiology Evolutionary Biology Chemical Sciences not elsewhere classified Marine Biology rietveld refinement reveal powder xrd patterns earth perovskite oxide gas flow rate formation processes governing conventional preparation conditions 4 +</ sup 3 </ sup 3 +</ sup highest phase purity high phase purity 3 </ sub 2 </ sub via hydrogen reduction flow rate phase purity hydrogen reduction powder x stepwise reduction competing reduction strongly depends rietveld analysis reducing conditions redox applications readily oxidized ray diffraction potential catalytic partial pressure mixed oxides intermediate products feo generated controllable route 99 mol Cerium orthoferrite (CeFeO₃) is a rare-earth perovskite oxide with potential catalytic and redox applications, but its bulk synthesis remains challenging because Ce³⁺ is readily oxidized to the stable Ce⁴⁺ oxide CeO₂ under conventional preparation conditions. Herein, we demonstrate that CeFeO₃ with high phase purity can be synthesized from CeO₂–Fe₂O₃ mixed oxides by hydrogen reduction at 1073 K through control of the H₂ partial pressure and gas flow rate. Powder X-ray diffraction and Rietveld refinement reveal that the phase purity of CeFeO₃ strongly depends on the reducing conditions and increases with decreasing H₂ partial pressure and flow rate. The highest phase purity, 99 mol % by Rietveld analysis, was obtained at PH2 = 1.25% and FH2 = 50.0 cm³ min^–1. Analysis of H₂ consumption, powder XRD patterns of intermediate products, and Fe K-edge and Ce L₃-edge XANES spectra show that CeFeO₃ forms through the reaction of CeO₂ with FeO generated by the stepwise reduction of Fe₂O₃. These results establish hydrogen reduction of CeO₂–Fe₂O₃ mixed oxides as a simple and controllable route to bulk CeFeO₃ and clarify the competing reduction and phase-formation processes governing its synthesis. 2026-10-01T00:00:00Z Text Journal contribution 10.1021/acs.inorgchem.6c03361.s001 https://figshare.com/articles/journal_contribution/Conditions_and_Mechanism_for_the_Formation_of_CeFeO_sub_3_sub_via_Hydrogen_Reduction_of_CeO_sub_2_sub_Fe_sub_2_sub_O_sub_3_sub_Mixed_Oxides/34040628 CC BY-NC 4.0