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Peer-reviewedCC BY-NC-NDInorganic chemistry

Conditions and Mechanism for the Formation of CeFeO3 via Hydrogen Reduction of CeO2-Fe2O3 Mixed Oxides.

  • Masahiro Fujisaki1,2
  • Sota Fukudome1
  • Yo Hoshimori1
  • Hiroyuki Yamaura1
  • Syuhei Yamaguchi1
  • Hiroyuki Setoyama3
  • Rie Suizu4
  • Hidenori Yahiro1
4 affiliations
  1. 1Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-Cho, Matsuyama, Ehime790-8577, Japan.
  2. 2Research Unit for Materials Development for Efficient Utilization and Storage of Energy, Ehime University, 2-5 Bunkyo-Cho, Matsuyama, Ehime790-8577, Japan.
  3. 3Kyushu Synchrotron Light Research Center, Saga Industrial Promotion Organization, 8-7 Yayoigaoka, Tosu, Saga841-0005, Japan.
  4. 4Synchrotron Light Application Center, Saga University, 1 Honjo, Saga840-8502, Japan.
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Abstract

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.

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Cite

BibTeXRIS
BibTeX
@article{fujisaki2026conditions,
  title = {{Conditions and Mechanism for the Formation of CeFeO3 via Hydrogen Reduction of CeO2-Fe2O3 Mixed Oxides.}},
  author = {Masahiro Fujisaki and Sota Fukudome and Yo Hoshimori and Hiroyuki Yamaura and Syuhei Yamaguchi and Hiroyuki Setoyama and Rie Suizu and Hidenori Yahiro},
  journal = {Inorganic chemistry},
  year = {2026},
  month = oct,
  doi = {10.1021/acs.inorgchem.6c03361},
  url = {https://europepmc.org/article/MED/42916946},
  note = {CC BY-NC-ND},
}
RIS
TY  - JOUR
TI  - Conditions and Mechanism for the Formation of CeFeO3 via Hydrogen Reduction of CeO2-Fe2O3 Mixed Oxides.
AU  - Masahiro Fujisaki
AU  - Sota Fukudome
AU  - Yo Hoshimori
AU  - Hiroyuki Yamaura
AU  - Syuhei Yamaguchi
AU  - Hiroyuki Setoyama
AU  - Rie Suizu
AU  - Hidenori Yahiro
PY  - 2026
DA  - 2026/10/01
JO  - Inorganic chemistry
DO  - 10.1021/acs.inorgchem.6c03361
UR  - https://europepmc.org/article/MED/42916946
AB  - 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.
SN  - 0020-1669
SN  - 1520-510X
ER  -