2013年11月
Distribution change of oxygen vacancies in layered perovskite type(Sr, La)(n+) iFenO3n+1 (n=3)
JOURNAL OF SOLID STATE CHEMISTRY
- ,
- ,
- 巻
- 207
- 号
- 開始ページ
- 184
- 終了ページ
- 189
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.jssc.2013.08.030
- 出版者・発行元
- ACADEMIC PRESS INC ELSEVIER SCIENCE
To elucidate characteristic oxygen vacancy formation in layered perovskite (Sr, La)(n+1)Fe O-n(3n+1) With the perovskite layer number: n=3, oxygen vacancy content delta of the (Sr0.775La0.225)(4)Fe3O10-delta (SLF4310) was investigated using a titration technique and a thermogravimetric analysis. The equilibrium constant K for the reduction reaction: Oo(x) +2Fe(Fe)(center dot) (Fe4+)=1/2O(2)+Vo(center dot center dot) +2Fe(Fe) (x) (Fe3+) was estimated using the vacancy content delta. The Arrhenius plot of the K reveals slope change at approximately 775 degrees C. From the Rietveld analysis, the oxygen vacancies are the most remarkable at the O2 (O4) sites at lower (higher) temperatures than about 800 degrees C, which temperature is approximately comparable with that of slope change in the K. These facts mean that distribution of vacancy sites in the SLF4310 changes at approximately 775 degrees C, accompanying no structural phase transition. The vacancy distribution change affects to the ion conductivity of the SLF4310. (C) 2013 Elsevier Inc. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/j.jssc.2013.08.030
- ISSN : 0022-4596
- eISSN : 1095-726X
- Web of Science ID : WOS:000326850200027