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| Titel |
Iron M-edge x-ray Raman scattering spectroscopy - a tool to determine Fe speciation at conditions of deep Earth |
| VerfasserIn |
Alexander Nyrow, Christian Sternemann, Max Wilke, Kolja Mende, Thomas Büning, Robert A. Gordon, Hasan Yavas, Laura Simonelli, Nozumo Hiraoka, Serge Desgreniers, Christoph J. Sahle, Simo Huotari, Giovanni B. Andreozzi, Alan B. Woodland, Metin Tolan, John S. Tse |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100595
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| Publikation (Nr.) |
 EGU/EGU2014-16578.pdf |
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| Zusammenfassung |
| We present a spectroscopic study of the iron M2,3-edge for several minerals and compounds
to reveal information about the oxidation state, local coordination and spin state of iron. We
describe a novel approach to probe the iron M-edge bulk sensitively using non-resonant
inelastic x-ray scattering. Significant changes in the onset and shape of the Fe M-edge were
observed demonstrating the capabilities of x-ray Raman scattering spectroscopy to extract
information on the Fe3+/Fetot ratio and local coordination. In-situ measurements of the
pressure-induced spin transition in FeS even demonstrate that this technique allows for
detection of the spin cross-over as well as characterization of the electronic properties of the
low-spin phase. Thus, x-ray Raman spectroscopy is suitable for obtaining detailed
insights to the properties of Fe in-situ at high pressure and temperature providing
indispensable information for many physical and chemical processes of the deep Earth. |
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