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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 5: Poster Session KFM
KFM 5.14: Poster
Dienstag, 28. September 2021, 16:00–17:00, P
Investigation of the Electronic Structure of Iron in Bridgmanite at Deep Mantle Pressure Conditions by (Resonant) X-ray Emission Spectroscopy — •Robin Sakrowski1, Georg Spiekermann2, Christian Albers1, Nicola Thiering1, Lélia Libon3, Hlynur Gretarsson4, Martin Sundermann4, Jean-Pascal Rueff5, James Ablett5, Metin Tolan1, Max Wilke3, and Christian Sternemann1 — 1Faculty of Physics/DELTA, TU Dortmund University — 2Institute of Geochemistry and Petrology, ETH Zurich — 3Institute of Geosciences, University of Potsdam — 4Deutsches-Elektronen-Synchrotron DESY — 5Synchrotron SOLEIL
We study the controversially discussed iron spin state in pressurized ferrous (Fe2+) and ferric (Fe3+) bridgmanite, as well as coordination state and oxidation state. For that, we use a combination of novel approaches like in situ resonant X-ray emission (RXES) at the iron K-pre-edge region, iron Kβ- and valence-to-core (vtc) X-ray emission spectroscopy (XES). We evaluate the Fe K pre-edge feature position and intensity from Kα HERFD XANES. Consequently, these methods help to further constrain the observed gradual (ferrous) or sharp (ferric) change in spin state, local coordination and oxidation state of iron in ferrous- (up to 140 GPa) and ferric- (up to 75 GPa) bridgmanite, aiming to solve the controversy on the iron’s spin state in bridgmanite.