Journal Article PUBDB-2023-06139

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MHz free electron laser x-ray diffraction and modeling of pulsed laser heated diamond anvil cell

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2023
American Inst. of Physics Melville, NY

Journal of applied physics 134(9), 095904 () [10.1063/5.0149836]
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Abstract: 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. Here, 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.

Classification:

Contributing Institute(s):
  1. DOOR-User (DOOR ; HAS-User)
  2. PETRA-D (FS-PETRA-D)
  3. FS-PS Fachgruppe HIBEF (FS-HIBEF)
  4. HED (XFEL_E1_HED)
Research Program(s):
  1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
Experiment(s):
  1. HED: High-Density matter Experiments (SASE2)

Appears in the scientific report 2023
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Medline ; OpenAccess ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection
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Private Collections > >DESY > >FS > FS-PETRA-D
Private Collections > >DESY > >FS > FS-HIBEF
Private Collections > >XFEL.EU > XFEL_E1_HED
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 Record created 2023-10-08, last modified 2025-07-15


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