Authors: | Albers, Christian Sakrowski, Robin Thiering, Nicola Libon, Lélia Spiekermann, Georg Kaa, Johannes M. Gretarsson, Hlynur Sundermann, Martin Tolan, Metin Wilke, Max Sternemann, Christian |
Title: | High-efficiency X-ray emission spectroscopy of cold-compressed Fe2O3 and laser-heated pressurized FeCO3 using a von Hámos spectrometer |
Language (ISO): | en |
Abstract: | X-ray spectroscopy of iron-bearing compounds under high pressure and high temperature is an important tool to understand geological processes in the deep Earth. However, the sample environment using a diamond anvil cell complicates spectroscopic measurements and leads to long data acquisition times. We present a setup for resonant and non-resonant X-ray emission spectroscopy and showcase its capabilities for in situ studies at high pressure and high temperature. Spin-state imaging of laser-heated FeCO3 at 75 GPa via Kβ1,3 emission spectroscopy demonstrates the great potential of this setup with measurement times within seconds for robust spin-state analysis results. The results of Kβ1,3 emission spectroscopy of cold-compressed Fe2O3 reveal a two-step spin transition with the ζ-phase between 57 GPa and 64 GPa, having iron in different spin states at the different iron sites. The phase transition via ζ- to Θ-phase causes a delocalization of the electronic states, which is supported by 1s2p resonant X-ray emission spectroscopy. |
URI: | http://hdl.handle.net/2003/42585 http://dx.doi.org/10.17877/DE290R-24420 |
Issue Date: | 2023-04-04 |
Rights link: | https://creativecommons.org/licenses/by/3.0/ |
Appears in Collections: | Experimentelle Physik I |
Files in This Item:
File | Description | Size | Format | |
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d3ja00014a.pdf | DNB | 1.9 MB | Adobe PDF | View/Open |
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