Berlin 2024 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 16: Poster Ia
MM 16.7: Poster
Monday, March 18, 2024, 18:30–20:30, Poster E
Spin and phase state of iron in FeS at Martian core conditions — •G. Scholz1, C. Albers1, H. Gretarsson2, G. Kovalskii3, M. Mezouar4, W. Morgenroth3, L. Pennacchioni3, J. Savelkouls1, M. Sundermann2, N. Thiering1, M. Wilke3, and C. Sternemann1 — 1TU Dortmund, Dortmund, Germany — 2Deutsches Elektronen-Synchrotron, Hamburg, Germany — 3University of Potsdam, Potsdam, Germany — 4European Synchrotron Radiation Facility, Grenoble, France
The Martian core is assumed to be comprised of molten FeNi with up to 15 wt% S and 5 wt% O. To further understand the electronic structure of iron, we investigated the changes in phase state and spin state in FeS, a simplified core composition, which are induced by high pressure (p) and high temperature (T).
In order to explore this topic, we conducted in situ (resonant) X-ray emission spectroscopy at beamline P01, PETRA III (DESY) using a von Hamos spectrometer. We used diamond anvil cells in combination with a double-sided Yb:YAG-laser heating setup to achieve pressure and temperature conditions up to 64 GPa and 3000 K, respectively. The phase state of FeS was evaluated at beamline ID27, ESRF with X-ray diffraction combined with double-sided in situ laser heating up to 43 GPa and 3000 K.
In both experiments, our focus was set on the temperature induced phase transition from FeS-III to -IV and -V and the potential spin state change at p/T-conditions of the FeS-IV and -V phase transition boundary.
Keywords: iron sulfide; Martian core; X-ray emission spectroscopy; X-ray diffraction; diamond anvil cell