Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 31: Nanocharacterization
MM 31.3: Vortrag
Mittwoch, 28. März 2012, 10:45–11:00, H 1029
Iron L- and M-edges of iron containing minerals measured by inelastic x-ray scattering — •Alexander Nyrow1, Christian Sternemann1, Max Wilke2, Christoph Sahle1, Kolja Mende1, Laura Simonelli3, Robert Gordon4, Nozomu Hiraoka5, Florian Wieland1, Metin Tolan1, and John Tse6 — 1Fakultät Physik/DELTA, Technische Universität Dortmund, D-44221 Dortmund, Germany — 2Deutsches GeoForschungsZentrum, Section 3.3, Potsdam, Germany — 3European Synchrotron Radiation Facility, F-38043 Grenoble Cedex, France — 4PNC-SRF, Dept. of Physics, Simon Fraser University, Burnaby, BC, Canada — 5National Synchrotron Radiation Research Center, Taiwan — 6University of Saskatchewan, Department of Physics and Engineering Physics, Saskatoon, Canada
Iron is one of the most important elements which form the Earth’s mantle. Most physical properties of the Earth’s interior have been extracted from seismological observations or structural laboratory studies of phases attendant in the Earth’s body. Depending on pressure, temperature and oxygen fugacity the Fe2+/Fe3+ ratios and the Fe spin-state of iron-bearing minerals can vary significantly. Thus, a quantitative determination of the oxidation state of iron is crucial for the understanding of the thermodynamic properties of these minerals at the conditions of the deep Earth. In this study Fe L2/3 and M2/3-edges of different iron oxides and iron containing minerals measured by x-ray Raman scattering are presented in comparison with results of soft x-ray absorption and electron energy loss spectroscopy. Furthermore, the momentum transfer dependency of the Fe M2/3-edge is discussed.