Reversible fluorination of brownmillerite SrCoO2.5 by MgF2 annealing

Yongxiang Ma; Yuanmin Zhu; Yihao Yang; Qi Liu; Sixia Hu; Songbai Hu; Lang Chen

doi:10.1039/D5DT00262A

Reversible fluorination of brownmillerite SrCoO_2.5 by MgF₂ annealing†

Yongxiang Ma,

‡^a Yuanmin Zhu,‡^c Yihao Yang,^a Qi Liu,^a Sixia Hu,^d Songbai Hu*^ab and Lang Chen*^a

Author affiliations

* Corresponding authors

^a Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
E-mail: chenlang@sustech.edu.cn, husongbai@gbu.edu.cn

^b School of Physical Science, Great Bay University, Dongguan, China

^c Research Institute of Interdisciplinary Science & School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, China

^d Core Research Facilities, Southern University of Science and Technology, Shenzhen 518055, China

Abstract

Two distinct oxyfluorides were synthesized by annealing a brownmillerite SrCoO_2.5 (BM-SCO) thin film in MgF₂ powder through soft-chemistry reduction. Throughout the annealing, BM-SCO undergoes two successive phase transitions, which are referred to as perovskite F-doped SrCoO_x (P-SCOF) and brownmillerite F-doped SrCoO_x (BM-SCOF). P-SCOF retains randomly distributed F-ions, while BM-SCOF forms an F-ordered structure characterized by alternative stacking of square-planar CoO₂F₂ and octahedral CoO₄F₂. These three phases could change into each other reversibly under moderate conditions, thereby providing a pathway to extract high-purity F₂ with perovskite catalysts.

This article is part of the themed collection: Spotlight Collection: Mixed-Anion Compounds

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Article information

DOI: https://doi.org/10.1039/D5DT00262A
Article type: Paper
Submitted: 02 Feb 2025
Accepted: 07 Apr 2025
First published: 08 Apr 2025

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Dalton Trans., 2025, Advance Article

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Reversible fluorination of brownmillerite SrCoO_2.5 by MgF₂ annealing

Y. Ma, Y. Zhu, Y. Yang, Q. Liu, S. Hu, S. Hu and L. Chen, Dalton Trans., 2025, Advance Article , DOI: 10.1039/D5DT00262A

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