Local structure of magnetite and maghemite and chemical shift in the Fe K-edge XANES
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- OKUDERA Hiroki
- Graduate School of Science and Technology, Kanazawa University
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- YOSHIASA Akira
- Graduate School of Science and Technology, Kumamoto University
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- MURAI Kei-ichiro
- Department of Chemical Science and Technology, Tokushima University
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- OKUBE Maki
- Material and Structures Lab., Tokyo Institute of Technology
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- TAKEDA Takashi
- Nano Ceramics Center, National Institute for Materials Science
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- KIKKAWA Shinichi
- Graduate School of Engineering, Hokkaido University
書誌事項
- タイトル別名
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- Local structure of magnetite and maghemite and chemical shift in Fe K-edge XANES
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Local structures around Fe and chemical shifts in X-ray absorption fine structure (XAFS) spectra were investigated for synthetic Fe1-dO, Fe3O4 (magnetite), γ-Fe2O3(maghemite), and SrFeO3-e, as well as natural Fe3O4 and α-Fe2O3 (hematite) specimens. XAFS spectra near the Fe K-edge were measured at BL-9C and BL-12C of the Photon Factory, KEK, Japan. Similar measurements for Fe-N pairs in Fe nitrides (FeN, Fe2N, Fe4N) were obtained for comparison. The X-ray absorption near edge structure (XANES) spectra for various iron compounds, in particular Fe3O4 and γ-Fe2O3, and FexN specimens, showed clear chemical shifts of half-maximum positions with the changing oxidation states of the Fe ions in their structures. The energy at half maximum position should be used for the quantitative discussion of the oxidation and valence states of the Fe ion in Fe compounds rather than the threshold energy E0 found using differentiating XAFS spectra. The δ values in Fe3-δO4 (δ=0.333 for end-member γ-Fe2O3) for magnetite and maghemite were estimated by the extent of the chemical shifts. Decreases in the average Fe-O distances and extended X-ray absorption fine structure (EXAFS) Debye-Waller factor σ2 values for spinel-type Fe3-δO4 solid-solutions were consistent with the estimated δ values. The error in proving the Fe3+/Fetotal ratio in the system by the XAFS method would appear to be less than ±0.10, and higher reliability than this value would be acquired in the comparison of relative values at half-maximum positions.
収録刊行物
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 107 (3), 127-132, 2012
一般社団法人 日本鉱物科学会
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詳細情報 詳細情報について
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- CRID
- 1390001206546219648
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- NII論文ID
- 10030499207
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- NII書誌ID
- AA11460926
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- BIBCODE
- 2012JMPeS.107..127O
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- COI
- 1:CAS:528:DC%2BC38Xht1GitrvK
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- ISSN
- 13493825
- 13456296
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- 本文言語コード
- en
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- データソース種別
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- JaLC
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- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可