Reversible fluorination of brownmillerite SrCoO<sub>2.5</sub> by MgF<sub>2</sub> annealing
Two distinct oxyfluorides were synthesized by annealing a brownmillerite SrCoO<sub>2.5</sub> (BM-SCO) thin film in MgF<sub>2</sub> powder through soft-chemistry reduction. Throughout the annealing, BM-SCO undergoes two successive phase transitions, which are referred to as perovskite F-doped SrCoO<sub><i>x</i></sub> (P-SCOF) and brownmillerite F-doped SrCoO<sub><i>x</i></sub> (BM-SCOF). P-SCOF retains randomly distributed F-ions, while BM-SCOF forms an F-ordered structure characterized by alternative stacking of square-planar CoO<sub>2</sub>F<sub>2</sub> and octahedral CoO<sub>4</sub>F<sub>2</sub>. These three phases could change into each other reversibly under moderate conditions, thereby providing a pathway to extract high-purity F<sub>2</sub> with perovskite catalysts.
Authors
- Sixia Hu (ORCID: https://orcid.org/0000-0002-7568-6786)
- Yuanmin Zhu (ORCID: https://orcid.org/0000-0001-9554-3005)
- Yihao Yang (ORCID: https://orcid.org/0000-0001-5387-0411)
- Qi Liu
- Lang Chen (ORCID: https://orcid.org/0000-0003-2460-8232)
- Yongxiang Ma
- Songbai Hu (ORCID: https://orcid.org/0000-0002-0183-9559)
Institutions
- Dongguan University of Technology (CN)
- Southern University of Science and Technology (CN)
Publication Details
- Journal
- Dalton Transactions
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d5dt00262a
- Primary Topic
- Inorganic Fluorides and Related Compounds
- Type
- article
- Field-Weighted Citation Impact
- 0.00