Publications by authors named "Julien Chantel"
Article Synopsis
- The study investigates the local structure and physical properties of molten silicates under extreme conditions, which are important for understanding planetary evolution.
- Researchers used advanced techniques like in situ X-ray diffraction and high-power lasers to analyze shock-compressed liquid silicates with varying iron content at extremely high pressures.
- Findings suggest that the densification of silicate networks continues beyond pressures found in Earth's interior, potentially affecting the formation and differentiation of rocky planets and super-Earths.
Article Synopsis
- A high-pressure torsion apparatus, combined with in situ X-ray tomography (XRT), allows for the investigation of microstructures in materials under large shear strains.
- Deformation experiments on multi-phase samples were conducted at pressures of 3-5 GPa and temperatures of 300-500°C, measuring the shear strain in relation to the angles of anvil twisting.
- The study explores 2D and 3D quantifications of microfabrics in two-phase aggregates under high shear strain, while also addressing limitations in real-time investigation using this combined technology.
The ultrafast synthesis of ε-FeN in a diamond-anvil cell (DAC) from Fe and N under pressure was observed using serial exposures of an X-ray free electron laser (XFEL). When the sample at 5 GPa was irradiated by a pulse train separated by 443 ns, the estimated sample temperature at the delay time was above 1400 K, confirmed by transformation of α- to γ-iron. Ultimately, the Fe and N reacted uniformly throughout the beam path to form FeN, as deduced from its established equation of state (EOS).
View Article and Find Full Text PDFThe low-velocity zone (LVZ) is a persistent seismic feature in a broad range of geological contexts. It coincides in depth with the asthenosphere, a mantle region of lowered viscosity that may be essential to enabling plate motions. The LVZ has been proposed to originate from either partial melting or a change in the rheological properties of solid mantle minerals.
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