Yongxiang Ma, Yuanmin Zhu, Yihao Yang, Qi Liu, Sixia Hu, Songbai Hu and Lang Chen
{"title":"Reversible fluorination of brownmillerite SrCoO2.5 by MgF2 annealing†","authors":"Yongxiang Ma, Yuanmin Zhu, Yihao Yang, Qi Liu, Sixia Hu, Songbai Hu and Lang Chen","doi":"10.1039/D5DT00262A","DOIUrl":null,"url":null,"abstract":"<p >Two distinct oxyfluorides were synthesized by annealing a brownmillerite SrCoO<small><sub>2.5</sub></small> (BM-SCO) thin film in MgF<small><sub>2</sub></small> powder through soft-chemistry reduction. Throughout the annealing, BM-SCO undergoes two successive phase transitions, which are referred to as perovskite F-doped SrCoO<small><sub><em>x</em></sub></small> (P-SCOF) and brownmillerite F-doped SrCoO<small><sub><em>x</em></sub></small> (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<small><sub>2</sub></small>F<small><sub>2</sub></small> and octahedral CoO<small><sub>4</sub></small>F<small><sub>2</sub></small>. These three phases could change into each other reversibly under moderate conditions, thereby providing a pathway to extract high-purity F<small><sub>2</sub></small> with perovskite catalysts.</p>","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":" 20","pages":" 8298-8305"},"PeriodicalIF":3.3000,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Dalton Transactions","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2025/dt/d5dt00262a","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
Two distinct oxyfluorides were synthesized by annealing a brownmillerite SrCoO2.5 (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 SrCoOx (P-SCOF) and brownmillerite F-doped SrCoOx (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.
期刊介绍：
Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.
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