SKM 2021 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 5: Poster Session KFM

KFM 5.13: Poster

Dienstag, 28. September 2021, 16:00–17:00, P

X-ray emission scanning imaging setup to study electronic structure of iron bearing compounds in-situ at conditions of the Earth’s mantle — •Christian Albers¹, Georg Spiekermann², Lélia Libon³, Robin Sakrowski¹, Max Wilke³, Johannes Kaa⁴, Nicola Thiering¹, Hlynur Gretarrson⁵, Martin Sundermann⁵, Metin Tolan¹, and Christian Sternemann¹ — ¹Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, Germany — ²Institut für Geochemie und Petrologie, ETH Zürich — ³Institut für Geowissenschaften, Universität Potsdam, Potsdam, Germany — ⁴HED Group, European XFEL GmbH, Hamburg, Germany — ⁵Deutschen-Elektronen-Synchrotron DESY, Hamburg, Germany

The determination of the electronic structure in iron-bearing compounds under high pressure and high temperature (HPHT) conditions is of crucial importance for the understanding of the Earth’s interior and planetary matter.
We present a setup to investigate the electronic structure of iron-bearing compounds in-situ at HPHT conditions using X-ray emission spectroscopy (XES) and show first results for tetracarbonate phases emerged from laser heated siderite (FeCO₃) at about 80 GPa and 3000 K. Information on the spin state are obtained by in-situ XES of the iron’s Kβ-emission. A dedicated sample preparation together with highly intense synchrotron radiation shortens the duration of the measurements to an extend that in-situ XES, including valence-to-core XES, as well as in-situ spin state imaging becomes feasible.