Iron speciation in minerals and glasses probed by \(\hbox{M}_{2/3}\) -edge X-r

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• 作者：A. Nyrow (1)
  C. Sternemann (1)
  M. Wilke (2)
  R. A. Gordon (3)
  K. Mende (1)
  H. Yava艧 (4)
  L. Simonelli (5) (6)
  N. Hiraoka (7)
  Ch. J. Sahle (8)
  S. Huotari (8)
  G. B. Andreozzi (9)
  A. B. Woodland (10)
  M. Tolan (1)
  J. S. Tse (11)
  
  1. Fakult盲t Physik/DELTA ; Technische Universit盲t Dortmund ; 44221 ; Dortmund ; Germany
  2. Section 3.3 ; Deutsches GeoForschungsZentrum ; 14473 ; Potsdam ; Germany
  3. PNCSRF ; APS Sector 20 ; Argonne ; IL ; 60439 ; USA
  4. Photon Science ; DESY ; 22607 ; Hamburg ; Germany
  5. European Synchrotron Radiation Facility ; 38043 ; Grenoble Cedex ; France
  6. ALBA Synchrotron Light Facility ; CELLS ; Barcelona ; Spain
  7. National Synchrotron Radiation Research Center ; Hsinchu ; 30076 ; Taiwan
  8. Department of Physics ; University of Helsinki ; P.O. Box 64 ; 00014 ; Helsinki ; Finland
  9. Dipartimento di Scienze della Terra ; Sapienza Universit脿 di Roma ; 00185 ; Rome ; Italy
  10. Institut f眉r Geowissenschaften ; Universit盲t Frankfurt ; Altenh枚ferallee 1 ; 60438 ; Frankfurt ; Germany
  11. Department of Physics and Engineering Physics ; University of Saskatchewan ; Saskatoon ; S7N 5E2 ; Canada
  
• 关键词：Iron speciation ; Minerals ; X ; Ray scattering ; X ; Ray absorption spectroscopy
• 刊名：Contributions to Mineralogy and Petrology
• 出版年：2014
• 出版时间：May 2014
• 年：2014
• 卷：167
• 期：5
• 全文大小：783 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Mineral Resources
  Mineralogy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0967

文摘

We present a spectroscopic study of the iron \(\hbox{M}_{2/3}\) -edge for several minerals and compounds to reveal information about the oxidation state and the local coordination of iron. We describe a novel approach to probe the iron \(\hbox{M}_{2/3}\) -edge bulk sensitively using X-ray Raman scattering. Significant changes in the onset and shape of the Fe \(\hbox{M}_{2/3}\) -edge were observed on ferrous and ferric model compounds with Fe in octahedral and tetrahedral coordination. Simulation of the spectra is possible using an atomic multiplet code, which potentially allows determination of, e.g., crystal-field parameters in a quantitative manner. A protocol is discussed for determination of the Fe oxidation state in compounds by linear combination of spectra of ferric and ferrous end members. The presented results demonstrate the capabilities of Fe \(\hbox{M}_{2/3}\) -edge spectroscopy by X-ray Raman scattering to extract information on the ratio of trivalent to total iron \(\hbox{Fe}^{3+}/\sum \hbox{Fe}\) and local coordination. As X-ray Raman scattering is performed with hard X-rays, this approach is suitable for in situ experiments at high pressure and temperature. It thus may provide indispensable information on oxidation state, electronic structure and local structure of materials that are important for physical and chemical processes of the deep Earth.