Reversible Fluorination in Brownmillerite SrCoO2.5 by MgF2 annealing

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Dalton Transactions Pub Date : 2025-04-08 DOI:10.1039/d5dt00262a

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

引用次数: 0

Abstract

Two distinct oxyfluorides were synthesized by annealing 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 were 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 to each other reversibly under moderate conditions, thereby providing a pathway to extract high-purity F2 with perovskite catalysts.

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MgF2退火对褐煤SrCoO2.5可逆氟化的影响

采用软化学还原法，在MgF2粉末中对褐铁矿SrCoO2.5 （BM-SCO）薄膜进行退火，合成了两种不同的氟氧化物。在整个退火过程中，BM-SCO经历了两个连续的相变，即钙钛矿f掺杂SrCoOx （P-SCOF）和棕粉矿f掺杂SrCoOx （BM-SCOF）。P-SCOF保留随机分布的f离子；BM-SCOF形成了方形平面CoO₂F₂和八面体CoO₄F₂交替叠加的F有序结构。在中等条件下，这三相可以可逆地相互转化，从而为钙钛矿催化剂提取高纯度F2提供了一条途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Dalton Transactions 化学-无机化学与核化学

CiteScore

6.60

自引率

7.50%

发文量

1832

审稿时长

1.5 months

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.