Influences of Hydration‐Dehydration on Local Structure in Layered Perovskite LaSr3Fe3O10. Issue 21 (1st June 2022)

• Record Type: Journal Article
• Authors: Yagi, Yutaro; Wakita, Yudai; Kagomiya, Isao; Matsue, Ikuya; Kakimoto, Ken‐ichi; Matsumura, Daiju; Yoneda, Yasuhiro
• Is Part Of: ChemistrySelect. Volume 7:Issue 21(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-01
• Subjects: Hydrates -- Ion transport -- Iron compound -- Layered compounds -- X-ray absorption spectroscopy; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202104575
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: The layered perovskite LaSr3 Fe3 O10 (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 H2 O 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 H2 O 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. Abstract : Hydration effects on local structures in layered perovskites LaSr3 Fe3 O10 (LSF) were investigated by Extended X‐ray absorption fine structure analysis at intermediate temperature range. The results suggest that intercalated H2 O expands interlayer space by shoving La sites to c ‐axis direction and OH − ions placed on O3 sites near Sr1 ions play a major role in OH − ion transit.