A5066322207- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Rock Mechanics and Modeling
- Advanced ceramic materials synthesis
- Astro and Planetary Science
- X-ray Diffraction in Crystallography
- Geomagnetism and Paleomagnetism Studies
- Geological Studies and Exploration
- Mineral Processing and Grinding
- Geotechnical and Geomechanical Engineering
- Composite Material Mechanics
- Electronic and Structural Properties of Oxides
- Geochemistry and Geologic Mapping
- Hydrocarbon exploration and reservoir analysis
- Inorganic Fluorides and Related Compounds
- Hydrogen embrittlement and corrosion behaviors in metals
- Ferroelectric and Piezoelectric Materials
- Advanced Numerical Methods in Computational Mathematics
- Metallurgical Processes and Thermodynamics
- Advanced Surface Polishing Techniques
- Archaeological and Geological Studies
- Powder Metallurgy Techniques and Materials
- Minerals Flotation and Separation Techniques
- Microstructure and Mechanical Properties of Steels
Utrecht University
2024
Ehime University
2017-2024
Unité Matériaux et Transformations
2015-2021
Université de Lille
2015-2021
Centre National de la Recherche Scientifique
2016-2020
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2018-2020
École Centrale de Lille
2020
Universidad Metropolitana
2020
École Nationale Supérieure de Chimie de Lille
2018
Climb creep provides an efficient deformation mechanism for bridgmanite under lower mantle conditions.
Abstract The inner core, extending to 1,221 km above the Earth’s center at pressures between 329 and 364 GPa, is primarily composed of solid iron. Its rheological properties influence both rotation deformation core which a potential source observed seismic anisotropy. However, rheology poorly understood. We propose mineral physics approach based on density functional theory infer viscosity hexagonal close packed (hcp) iron pressure ( P ) temperature T ). As plastic rate-limited by atomic...
Abstract Polycrystalline (Mg,Fe)O ferropericlase is the second most abundant mantle constituent of Earth and possibly super‐Earth exoplanets. Its mechanical behavior expected to accommodate substantial plastic deformation in Earth's lower mantle. While bulk properties have been extensively studied, thermodynamics grain boundaries their role on response remain largely unexplored. Here, we use density functional theory calculations investigate {310}[001] boundary—a representative proxy for...
Deformation resulting from thermally activated plastic slip is modeled in Mg2SiO4 ringwoodite at 20 GPa for a wide range of temperatures. The model relies on the structures rate controlling 1/2〈110〉 screw dislocations which have been using Peierls–Nabarro–Galerkin method. These calculations are parametrized by density functional theory γ-surfaces {001},{110} and {111} planes. At finite temperatures, dislocation mobility controlled kink-pair nucleation 1/4〈110〉 partial as they occur...
The dynamics of the Earth's mantle is still poorly constrained due to lack understanding transfer matter between upper and lower their convective vigor. transition zone (TZ) might play a crucial role as interface connecting mantle. Here, we examine rheology main TZ minerals, wadsleyite, ringwoodite majorite garnet based on mineral physics approach. Using results lattice friction modeling dislocation glide mobilities together with available data self-diffusion in quantify plastic deformation...
Thermally activated dislocation glide in Mg2SiO4 wadsleyite at 15 GPa has been modeled to investigate its potential contribution plastic deformation of the Earth's transition zone. Modeling is based on a multiphysics approach that allows calculating constitutive equations associated with single slip for wide range temperatures and strain rates typical laboratory mantle. The model core structures rate limiting ½<111>{101} [100](010) dissociated screw dislocations. After quantifying their...
Recent progress in theoretical mineral physics based on the ab initio quantum mechanical computation method has been dramatic conjunction with rapid advancement of computer technologies. It is now possible to predict stability, elasticity, and transport properties complex minerals quantitatively uncertainties that are comparable or even smaller than those attached experimental data. These calculations under situ high-pressure ( P) high-temperature conditions particular interest because they...
An elastic interaction model is presented to quantify low temperature plasticity of SrTiO3 via glide dissociated 〈1 1 0〉{1 0} screw dislocations. Because 0〉 dislocations are dissociated, their glide, controlled by the kink-pair mechanism at T < 1050 K, involves formation kink-pairs on partial dislocations, either simultaneously or sequentially. Our yields results in good quantitative agreement with observed non-monotonic mechanical behaviour SrTiO3. This allows explain experimental terms a...
The viscoplastic behavior of polycrystalline Mg 2 SiO 4 wadsleyite aggregates, a major high pressure phase the mantle transition zone Earth (depth range: 410–520 km), is obtained by properly bridging several scale models. At very fine nanometric corresponding to dislocation core structure, thermally activated plastic slip modeled for strain-rates relevant laboratory experimental conditions, at and wide range temperatures, based on Peierls–Nabarro–Galerkin model. Corresponding single...
The viscoplastic behavior of polycrystalline Mg$_2$SiO$_4$ wadsleyite aggregates, a major high pressure phase the mantle transition zone Earth (depth range: 410 -- 520 km), is obtained by properly bridging several scale models. At very fine nanometric corresponding to disloca-tion core structure, thermally activated plastic slip modeled for strain-rates relevant laboratory experimental conditions, at and wide range temperatures, based on Peierls-Nabarro-Galerkin model. Corresponding single...
Serpentines are among the most abundant hydrous minerals in oceanic lithospheres formed by hydrothermal alteration of ultramafic mantle rocks (i.e. peridotites). Antigorite &#8211; high temperature and pressure variety serpentine is considered to be dominant water carrier within down-going slabs. The successive dehydration antigorite during subduction partially serpentinized strongly associated with cycle upper expected play an important role generation arc magmatism (Ulmer &amp;...