MHz free electron laser x-ray diffraction and modeling of pulsed laser heated diamond anvil cell
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- Université Grenoble Alpes, Université Savoie Mont Blanc, Grenoble (France)
- European XFEL GmbH 2, Schenefeld (Germany)
- DESY Deutsches Elektronen-Synchrotron 3, Hamburg (Germany)
- Albert-Ludwigs University of Freiburg, Freiburg (Germany)
- Technische University of Dortmund (Germany)
- University of Edinburgh, Scotland (United Kingdom)
- University Lille (France)
- Carnegie Institution for Science, Washington, DC (United States)
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Stony Brook University, NY (United States)
- University of Oxford (United Kingdom)
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Hanyang University 14, Seoul (Korea, Republic of)
- Yonsei University, Seoul (Korea, Republic of)
- University of Chicago, IL (United States)
- Sorbonne University, Paris (France)
- European Synchrotron Radiation Facility 18, Grenoble (France)
A new diamond anvil cell experimental approach has been implemented at the European x-ray Free Electron Laser, combining pulsed laser heating with MHz x-ray diffraction. In this report we use this setup to determine liquidus temperatures under extreme conditions, based on the determination of time-resolved crystallization. The focus is on a Fe-Si-O ternary system, relevant for planetary cores. This time-resolved diagnostic is complemented by a finite-element model, reproducing temporal temperature profiles measured experimentally using streaked optical pyrometry. This model calculates the temperature and strain fields by including (i) pressure and temperature dependencies of material properties, and (ii) the heat-induced thermal stress, including feedback effect on material parameter variations. Making our model more realistic, these improvements are critical as they give 7000 K temperature differences compared to previous models. Laser intensities are determined by seeking minimal deviation between measured and modeled temperatures. Combining models and streak optical pyrometry data extends temperature determination below detection limit. The presented approach can be used to infer the liquidus temperature by the appearance of SiO2 diffraction spots. In addition, temperatures obtained by the model agree with crystallization temperatures reported for Fe–Si alloys. Our model reproduces the planetary relevant experimental conditions, providing temperature, pressure, and volume conditions. Those predictions are then used to determine liquidus temperatures at experimental timescales where chemical migration is limited. This synergy of novel time-resolved experiments and finite-element modeling pushes further the interpretation capabilities in diamond anvil cell experiments.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- European Union’s Horizon 2020; German Research Foundation (DFG); Labex OSUG@2020; National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 2283287
- Report Number(s):
- LLNL--JRNL-859407; 1088827
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 134; ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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