A5071059769- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Ferroelectric and Piezoelectric Materials
- X-ray Spectroscopy and Fluorescence Analysis
- Crystallography and Radiation Phenomena
- Acoustic Wave Resonator Technologies
- Electron and X-Ray Spectroscopy Techniques
- Digital Holography and Microscopy
- Force Microscopy Techniques and Applications
- Advancements in Battery Materials
- Electronic and Structural Properties of Oxides
- Laser-Plasma Interactions and Diagnostics
- Optical Coherence Tomography Applications
- Electrochemical Analysis and Applications
- Advanced Surface Polishing Techniques
- Multiferroics and related materials
- Integrated Circuits and Semiconductor Failure Analysis
- X-ray Diffraction in Crystallography
- Advanced X-ray and CT Imaging
- Medical Imaging Techniques and Applications
- Nanowire Synthesis and Applications
- Semiconductor materials and interfaces
- Electrocatalysts for Energy Conversion
- Metal and Thin Film Mechanics
- Advanced Materials Characterization Techniques
European Synchrotron Radiation Facility
2016-2025
European Science Foundation
2017-2019
Paul Scherrer Institute
2011-2015
Swiss Light Source
2011-2015
London Centre for Nanotechnology
2009-2012
University College London
2009-2012
Argonne National Laboratory
2011
Advanced Photon Source
2011
Abstract We explore the use of continuous scanning during data acquisition for Bragg coherent diffraction imaging, i.e., where sample is in motion. The fidelity imaging demonstrated on a single Pt nanoparticle flow reactor at $$400\,^\circ \hbox {C}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>400</mml:mn> <mml:msup> <mml:mspace/> <mml:mo>∘</mml:mo> </mml:msup> <mml:mtext>C</mml:mtext> </mml:mrow> </mml:math> an Ar-based gas flowed 50 ml/min. show reduction...
The Materials Science beamline at the Swiss Light Source has been operational since 2001. In late 2010, original wiggler source was replaced with a novel insertion device, which allows unprecedented access to high photon energies from an undulator installed in medium-energy storage ring. order best exploit increased brilliance of this new source, entire front-end and optics had be redesigned. work, upgrade is described detail. tone didactic, it hoped reader can adapt concepts ideas his or her needs.
Abstract One major challenge in the field of lithium-ion batteries is to understand degradation mechanism high-energy lithium- and manganese-rich layered cathode materials. Although they can deliver 30 % excess capacity compared with today’s commercially- used cathodes, so-called voltage decay has been restricting their practical application. In order unravel nature this phenomenon, we have investigated systematically structural compositional dependence lithium insertion compounds on content...
The evolution of the atomic structure LaAlO3 grown on SrTiO3 was investigated using surface x-ray diffraction in conjunction with model-independent, phase-retrieval algorithms between two and five monolayers film thickness. A depolarizing buckling is observed cation oxygen positions response to electric field polar LaAlO3, which decreases increasing We explain this terms competition elastic strain energy, electrostatic electronic reconstructions. findings are qualitatively reproduced by...
We present a direct comparison between experimental data and ab initio calculations for the electrostrictive effect in polar LaAlO(3) layer grown on SrTiO(3) substrates. From structural data, complete screening of dipole field is observed film thicknesses 6 20 uc. For thinner films, an expansion c axis 2% matching theoretical predictions experimentally.
The ID01 beamline has been built to combine Bragg diffraction with imaging techniques produce a strain and mosaicity microscope for materials in their native or operando state. A scanning probe nano-focused beams, objective-lens-based full-field microscopy coherent provide suite of tools which deliver micrometre few nanometre spatial resolution combined 10 −5 −3 tilt sensitivity. detailed description the from source sample is provided serves as reference user community. anticipated impact...
The open-source PyNX toolkit [Favre-Nicolin et al (2011) arXiv:1010.2641, Mandula (2016)] has been extended to provide tools for coherent X-ray imaging data analysis and simulation. All calculations can be executed on graphical processing units (GPU) achieve high performance computing speeds. This used Coherent Diffraction Imaging (CDI), Ptychography wavefront propagation, in the far or near field regime. Moreover, all operations (propagation, projections, algorithm cycles..) Python as...
The combination of strain and electrostatic engineering in epitaxial heterostructures ferroelectric oxides offers many possibilities for inducing new phases, complex polar topologies, enhanced electrical properties. However, the dominant effect substrate clamping can also limit electromechanical response often leaves electrostatics to play a secondary role. Releasing mechanical constraint imposed by not only dramatically alter balance between elastic forces, enabling them compete on par with...
We present and demonstrate a formalism by which three-dimensional (3D) Bragg x-ray coherent diffraction imaging (BCDI) can be implemented without moving the sample scanning energy of incident beam. This capability is made possible introducing 3D Fourier transform that accounts for wavelength variability. approach inverting patterns from gold nanocrystal measured with an scan. Variable-wavelength BCDI will expand breadth feasible in situ strain experiments towards more diverse materials...
At the nanoscale, elastic strain and crystal defects largely influence properties functionalities of materials. The ability to predict structural evolution catalytic nanocrystals during reaction is primary importance for catalyst design. However, date, imaging characterising structure inside a nanocrystal in three-dimensions situ has remained challenge. We report here an unusual twin boundary migration process single platinum nanoparticle CO oxidation using Bragg coherent diffraction as...
Abstract Nanostructures with specific crystallographic planes display distinctive physico-chemical properties because of their unique atomic arrangements, resulting in widespread applications catalysis, energy conversion or sensing. Understanding strain dynamics and relationship facets have been largely unexplored. Here, we reveal situ, three-dimensions at the nanoscale, volume, surface interface evolution single supported platinum nanocrystals during reaction using coherent x-ray...
Abstract Lithiation dynamics and phase transition mechanisms in most battery cathode materials remain poorly understood, because of the challenge differentiating inter- intra-particle heterogeneity. In this work, structural evolution inside Li 1− x Mn 1.5 Ni 0.5 O 4 single crystals during electrochemical delithiation is directly resolved with operando X-ray nanodiffraction microscopy. Metastable domains solid-solution intermediates do not appear associated reaction front between lithiated...
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not.The documents may come from teaching institutions in France abroad, public private centers.L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement recherche français étrangers, laboratoires publics privés. Hard x-ray...
Unprecedented tools to image crystalline structure distributions in materials have been made possible by recent advances X-ray sources, optics and methods. Nanobeams combined with diffraction it parameters that were traditionally only addressed as ensemble averages. This enables the study of highly heterogeneous such microelectronic devices opens a new field material science on mesoscale. Coherent nanobeams offer opportunity nanomaterials three dimensions resolution far smaller than focused...
Nanoscale strain networks are reported in $\mathrm{BaTi}{\mathrm{O}}_{3}$ (BTO) crystals of 300 nm size using Bragg coherent diffractive imaging. BTO nanocrystals with clear facets were chosen to identify the crystallographic directions, allowing field direction and periodicity be studied detail. Stripes observed, which both stable preserved tetragonal cubic phases at elevated temperatures, above tetragonal-to-cubic phase transition. A finite element analysis approach was used simulate...
Abstract The nanoscale mechanisms of ion deintercalation in battery cathode materials remain poorly understood, especially the relationship between crystallographic defects (dislocations, small angle grain boundaries, vacancies, etc ), device performance, and durability. In this work, operando scanning X‐ray diffraction microscopy (SXDM) multi‐crystal (MCXD) are used to investigate microstrain lattice tilt inhomogeneities inside Li 1 − x Ni 0.5 Mn 1.5 O 4 particles during electrochemical...
We report a detailed investigation into the response of single <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:msub><a:mi>BaTiO</a:mi><a:mn>3</a:mn></a:msub></a:math> (BTO) nanocrystals under applied electric fields (E-field) using Bragg coherent diffraction imaging. Our study reveals pronounced domain wall migration and expansion sample measure field. The changes are most prominent at surface nanocrystal, where lack external strain allows greater mobility. observed shifts correlated...
<title>Abstract</title> The palladium-hydrogen system is essential for applications in water electrolysis, catalysis, hydrogen storage, and sensing technologies. Understanding the transition of Pd nanocrystals from hydrogen-poor (α) phase to hydrogen-rich (β) crucial elucidating absorption/desorption mechanisms, as well related phenomena such trapping. In this study, we employ situ Bragg Coherent Diffraction Imaging (BCDI) investigate individual palladium nanocrystals,mapping their strain...
Surface acoustic wave devices are key components for processing radio frequency signals in wireless communication because these offer simultaneously high performance, compact size and low cost. The optimization of the device structure requires a quantitative understanding energy conversion loss mechanisms. Here we use stroboscopic full-field diffraction x-ray microscopy to reveal an unanticipated prototypical one-port resonator device. A non-uniform excitation active area was responsible...
The moir\'e superstructure of a single layer carbon on ruthenium, where $25\ifmmode\times\else\texttimes\fi{}25$ graphene honeycombs sit $23\ifmmode\times\else\texttimes\fi{}23$ substrate unit cells, is determined from first principles. density functional theory (DFT) calculations predict two kinds structural units, $\ensuremath{\Omega}$ and $Y$, in the supercell, which are identified as beatings or moirons. related topographic bucklings, ``hills,'' have distinct conformations height 1.16...
Bragg coherent X-ray diffraction imaging (BCDI) has emerged as a powerful technique to image the local displacement field and strain in nanocrystals, three dimensions with nanometric spatial resolution. However, BCDI relies on both dataset collection phase retrieval algorithms that can induce artefacts reconstruction. Phase are based fast Fourier transform (FFT). We demonstrate how calculate inside nanocrystal from its reconstructed depending mathematical convention used for FFT. use...