Influences of Hydration‐Dehydration on Local Structure in Layered Perovskite LaSr <sub>3</sub> Fe <sub>3</sub> O <sub>10</sub>
Influences of Hydration‐Dehydration on Local Structure in Layered Perovskite LaSr <sub>3</sub> Fe <sub>3</sub> O <sub>10</sub>
复制标题
水合脱水对层状钙钛矿LaSr <sub>3</sub> Fe <sub>3</sub> O <sub>10</sub>局部结构的影响
DOI：
10.1002/slct.202104575
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发表时间：
2022
期刊：
影响因子：
2.1
通讯作者：
Yoneda Yasuhiro
中科院分区：
文献类型：
--
作者：
Yagi Yutaro;Wakita Yudai;Kagomiya Isao;Matsue Ikuya;Kakimoto Ken‐ichi;Matsumura Daiju;Yoneda Yasuhiro
层状钙钛矿LaSr 3Fe 3 O 10（LSF）在环境空气下容易水合。水合LSF在100 °C-250 °C的中温范围内运输氢氧化物。本研究使用X射线吸收精细结构分析从室温到350 °C的正常和水合LSF，以评估局部结构和离子传输特性之间的关系。H2O分子主要嵌入靠近La 1和O3位的岩盐夹层中。产生的OH−离子位于O3位置，比La离子更接近Sr离子。插入的H2O分子和形成的OH−离子扩展了岩盐夹层的空间。在这项研究中还研究了局部晶体结构的温度依赖性。根据研究结果，在O3位点上存在的OH−离子，更接近Sr离子，在中等温度范围内的OH−传输中起着重要作用。
The layered perovskite LaSr3Fe3O10(LSF) easily hydrates under ambient air. The hydrated LSF transports hydroxides in the middle‐temperature range of 100 °C–250 °C. This study used X‐ray absorption fine structure analysis on normal and hydrated LSF from room temperature to 350 °C to evaluate the relationship between local structures and ion transport characteristics. The H2O molecules are mainly intercalated into rock‐salt interlayers, which are close to the La1 and O3 sites. The generated OH−ions are found at O3 sites, which are closer to Sr ions than La ions. The intercalated H2O molecules and formed OH−ions expand the spaces of the rock‐salt interlayers. The temperature dependence of the local crystal structure was also studied in this study. According to the findings, the presence of OH−ions on the O3 sites, which are closer to Sr ions, plays a significant role in OH−transport in the medium temperature range.