A5005851291- X-ray Diffraction in Crystallography
- Ion-surface interactions and analysis
- Cultural Heritage Materials Analysis
- Nuclear materials and radiation effects
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Advancements in Battery Materials
- Ferroelectric and Piezoelectric Materials
- Glass properties and applications
- Crystallization and Solubility Studies
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Battery Materials and Technologies
- Advanced ceramic materials synthesis
- Advanced Condensed Matter Physics
- Integrated Circuits and Semiconductor Failure Analysis
- Rare-earth and actinide compounds
- Fusion materials and technologies
- Nuclear Materials and Properties
- Magnetic Properties of Alloys
- Building materials and conservation
- Semiconductor materials and devices
- Crystal Structures and Properties
- Iron-based superconductors research
- Crystallography and molecular interactions
Centre National de la Recherche Scientifique
2000-2024
Institut Néel
2007-2024
Université Grenoble Alpes
2024
Brookhaven National Laboratory
2011-2021
National Synchrotron Light Source II
2018-2020
Upton Hospital
2018-2020
Stanford Synchrotron Radiation Lightsource
2018
Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux
2010
Université de Lorraine
2010
CEA Grenoble
2010
Metal (M) oxides are one of the most interesting and widely used solids, many their properties can be directly correlated to local structural ordering within basic building units (BBUs). One particular example is high-Ni transition metal layered oxides, potential cathode materials for Li-ion batteries whose electrochemical activity largely determined by cationic in octahedra (e.g., BBUs such systems). Yet firmly established how inherited from precursors subsequently evolve into desired...
Using fast time‐resolved in situ X‐ray diffraction, charge‐rate dependent phase transition processes of layer structured cathode material LiNi 1/3 Mn Co O 2 for lithium‐ion batteries are studied. During first charge, intermediate phases emerge at high rates 10C, 30C, and 60C, but not low 0.1C 1C. These can be continuously observed during relaxation after the charging current is switched off. After half‐way rate, sample studied by scanning transmission electron microscopy shows Li‐rich...
Abstract We report on the emergence of robust superconducting order in single crystal alloys TaSe 2 − x S (0 ≤ × 2). The critical temperature alloy is surprisingly higher than that two end compounds and TaS . evolution T c ( ) correlates with full width at half maximum Bragg peaks linear term high-temperature resistivity. conductivity crystals near middle series or similar either one members 2H-TaSe and/or 2H-TaS It known these materials superconductivity close competition charge density...
The hierarchical nature of additively manufactured materials necessitates a multimodal approach for quantifying microstructural features and corresponding chemical heterogeneities that ultimately impact their properties performance. In laser powder-bed fusion (L-PBF) 316L stainless steel, corrosion behavior has been discussed in the context formed presence these microstructures. Here, we employ suite advanced synchrotron x-ray techniques correlative transmission electron microscopy analysis...
Abstract A portable system has been recently developed; it combines x‐ray fluorescence (XRF) and diffraction (XRD) techniques, allowing simultaneous elemental analysis phase identification of inorganic materials. low power (30 W) air‐cooled Cu anode source is used, equipped with a polycapillary semi‐lens to provide parallel beam. The designed without mechanical movements its configuration allows the objects arbitrary shapes; instrument particularly suitable for material in cultural heritage...
Hollandites (OMS-2) are an intriguing class of sorbents, catalysts, and energy storage materials with a tunnel structure permitting one-dimensional insertion deinsertion ions small molecules along the c direction. A 7-fold increase in delivered capacity for Li/AgxMn8O16 electrochemical cells (160 versus 23 mAh/g) observed upon seemingly change silver content (x ∼1.1 (L-Ag-OMS-2) 1.6 (H-Ag-OMS-2)) led us to characterize defects hollandite material. Herein, Ag nanorods studied through combined...
X-ray powder diffraction and crystal structure prediction algorithms are used in synergy to establish the of eighth polymorph ROY, form R05.
The development of technologies for nuclear reactors based on molten salts has seen a big resurgence. success thermodynamic models these hinges in part our ability to predict at the atomistic level behavior pure and their mixtures under range conditions. In this letter, we present high-energy X-ray scattering experiments molecular dynamics simulations that describe structure MgCl2 KCl. As one would expect, KCl is prototypical salt which governed by simple charge alternation. contrast, its...
The compressibility and thermal expansion of the cubic silicon nitride $(c\ensuremath{-}{\mathrm{Si}}_{3}{\mathrm{N}}_{4})$ phase have been investigated by performing in situ x-ray powder-diffraction measurements using synchrotron radiation, complemented with computer simulations means first-principles calculations. bulk $c\ensuremath{-}{\mathrm{Si}}_{3}{\mathrm{N}}_{4}$ originates from average both Si-N tetrahedral octahedral compressibilities where polyhedra are less compressible than...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study of cation environment and movement during dehydration reduction nickel-exchanged zeolite Y by x-ray absorption diffractionE. Dooryhee, C. R. A. Catlow, J. W. Couves, P. Maddox, M. Thomas, G. N. Greaves, T. Steel, TownsendCite this: Phys. Chem. 1991, 95, 11, 4514–4521Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1...
By means of normal-incidence, high-flux and high-energy X-rays, total scattering data for pair distribution function (PDF) analysis have been obtained from thin films (tf), suitable local structure analysis. using amorphous substrates as support the films, standard Rapid Acquisition PDF setup can be applied signal film isolated through subtraction an independently measured background signal. No angular corrections to are needed, would case grazing incidence measurements. The 'tfPDF' method...
Abstract Transition metal layered oxides have been the dominant cathodes in lithium‐ion batteries, and among them, high‐Ni ones (LiNi x Mn y Co z O 2 ; ≥ 0.7) with greatly boosted capacity reduced cost are of particular interest for large‐scale applications. The high Ni loading, on other hand, raises critical issues surface instability poor rate performance. rational design synthesis leading to LiNi 0.7 0.15 enhanced capability is demonstrated, by implementing a quenching process alternative...
Abstract Mudrocks and mud-sized sediments (i.e., silt to clay) dominate the surface of Earth Mars. These fine-grained preserve a rich history sedimentary processes from source sink shed light on ancient climates. However, both physical chemical nature these materials make them difficult fully characterize with traditional laboratory techniques. Here, we explore cross-disciplinary high-resolution approach synchrotron radiation for X-ray diffraction, pair distribution function analysis,...
For powder diffraction, high resolution can be best achieved using the parallel beam geometry with a monochromator/analyzer combination. However experiments are long and way to reduce this time without compromising is use several analyzer/ detector combinations mounted on single (theta) <SUB>a</SUB>/2(theta) <SUB>a</SUB> goniometer. We have developed such solution for 'Powder Diffraction' BM16-ESRF line. This device comprises nine analyzer/detectors, fixed prealigned offset of two degrees...
Enhancement of adsorption capacity and separation radioactive Xe/Kr at room temperature above is a challenging problem. Here, we report detailed structural refinement analysis the synchrotron X-ray powder diffraction data Ni-DODBC metal organic framework with in situ Xe Kr above. Our results reveal that adsorb open sites, geometries well reproduced by DFT calculations. The measured temperature-dependent substantially larger than for Kr, indicating selectivity over consistent more negative...
We have characterized at high temperature a model uniform heterogeneous catalyst for the oligomerization of hydrocarbons (a nickel-exchanged zeolite initial composition Na59Al59Si133O384·xH2O treated with an aqueous solution NiCl2 so as to yield homogeneous distribution Ni, Si/Ni = 7) by recording extended X-ray absorption fine structure (EXAFS) above Ni edge and also its high-resolution diffraction pattern (at λ= 1.5486 Å). obtained unique insights into microenvironment Ni2+ ions in...
In the search for stable and enduring organic colors, we have combined indigo, a historical industrially important chromophore, with silicalite, MFI zeolite. The resulting pigment presents high color durability against most external agents (e.g., light, temperature). This stability its physical properties are explained by association of indigo an inert mineral, which is also influenced formation conditions such as initial concentration thermal treatment. indigo@silicalite hybrid,...
The X-ray Powder Diffraction (XPD) beamline at the National Synchrotron Light Source II is a multi-purpose high-energy diffraction with high throughput and resolution. uses sagittally bent double-Laue crystal monochromator to provide X-rays over large energy range (30-70 keV). In this paper optical design calculated performance of XPD are presented. damping wiggler source simulated by SRW code filter system designed optimize photon flux as well reduce heat load on first optics. final under...
The combination of the multi-modal synchrotron approach and data analytics furthers understanding electrochemically-driven phase-transformation TiS<sub>2</sub>in Na-ion batteries.