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Cécile Hébert

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Publications associées (121)

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Experimental and theoretical determination of low electron energy loss spectra of Ag and Ru

Cécile Hébert

We show the experimental and calculated q-dependent low energy loss electron energy loss spectrum of Ru and Ag. The spectra were calculated within the time-dependent density-functional theory including local-field effects. For Ag, the momentum transfer was ...

2006

Stereo-vision three-dimensional reconstruction of curvilinear structures imaged with a TEM

Pascal Fua, Cécile Hébert, Emad Oveisi, Marco Cantoni, Guillaume Lucas, Sandro Ivo Sebastiano De Zanet

Deriving accurate three-dimensional (3-D) structural information of materials at the nanometre level is often crucial for understanding their properties. Tomography in transmission electron microscopy (TEM) is a powerful technique that provides such inform ...

Elsevier2017

In-Situ Observation of Co-Ce Coated Metallic Interconnect Oxidation Combined with High-Resolution Post Exposure Analysis

Jan Van Herle, Cécile Hébert, Stéphane François Jean Poitel

Oxidation of Sanergy SSHT steel with Ce-Co coating, used as interconnect material, was observed in-situ in a modified environmental scanning electron microscope (ESEM) at nominal temperature between 800°C and 900°C under 33Pa of oxygen, for different durat ...

2017

Quantitative imaging of flux vortices in the type-II superconductor MgB2 using cryo-Lorentz transmission electron microscopy

Cécile Hébert, Marco Cantoni, Fabrizio Carbone, Duncan Thomas Lindsay Alexander, Mathieu Julien Gino Cottet

Imaging of flux vortices in high quality MgB2 single crystals has been successfully performed in a commercial field-emission gun-based transmission electron microscope. In cryo-Lorentz microscopy, the sample quality and the vortex lattice can be monitored ...

Amer Physical Soc2013

Electron energy-loss spectroscopy investigations of the electron density in ErMn2 and ErMn2D2 compounds

Cécile Hébert

Hydrogen atoms introduced into a bulk of rare earth-transition metal compound influence the electronic structure of the material. Additional electrons are expected to change the number of free electrons per volume unit present in the system. Electron energ ...

2005

Toward Knowledge-Based Grain-Boundary Engineering of Transparent Alumina Combining Advanced TEM and Atomistic Modeling

Cécile Hébert, Paul Bowen, Marco Cantoni, Farhang Nabiei, Michael Stuer, Abhishek Tewari

Transition element dopants (e.g., Y, La) are commonly used as sintering aids in polycrystalline alumina ceramics, which segregate to the grain boundaries and control the grain-boundary mobility. However, due to the extremely thin (

Wiley-Blackwell2015

Leveraging Machine Learning for Advanced Nanoscale X-ray Analysis: Unmixing Multicomponent Signals and Enhancing Chemical Quantification

Cécile Hébert, Duncan Thomas Lindsay Alexander

Energy dispersive X-ray (EDX) spectroscopy in the transmission electron microscope is a key tool for nanomaterials analysis, providing a direct link between spatial and chemical information. However, using it for precisely determining chemical compositions ...

American Chemical Society (ACS)2024

Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope

Jan Van Herle, Cécile Hébert, Aïcha Hessler-Wyser, Quentin Thomas Jeangros

The oxidation of nickel particles was studied in situ in an environmental transmission electron microscope in 3.2 mbar of O-2 between ambient temperature and 600 degrees C. Several different transmission electron microscopy imaging techniques, electron dif ...

Pergamon-Elsevier Science Ltd2014

Magnetic circular dichroism in electron energy loss spectrometry

Cécile Hébert

The measurement of circular dichroism in the electron microscope is a new, emerging method and, as such, it is subject to constant refinement and improvement. Different ways can be envisaged to record the signal. We present an overview of the key steps in ...

2008

Enhanced Quantification for 3D Energy Dispersive Spectrometry: Going Beyond the Limitation of Large Volume of X-Ray Emission

Cécile Hébert, Marco Cantoni, Pierre Burdet

This paper presents a method developed to quantify three-dimensional energy dispersive spectrometry (3D EDS) data with voxel size smaller than the volume from which X-rays are emitted. The influence of the neighboring voxels is corrected by applying recurs ...

Cambridge University Press2014

Magnetic circular dichroism in electron microscopy

Cécile Hébert

Although the analogies between the electron energy loss spectra and X-ray absorption spectra were recognized long ago, the possibility to observe the magnetic circular dichroism in the electron microscope was demonstrated only recently. This technique comb ...

2008

Measurements of local chemistry and structure in Ni(O)-YSZ composites during reduction using energy-filtered environmental TEM

Jan Van Herle, Cécile Hébert, Aïcha Hessler-Wyser, Quentin Thomas Jeangros

Energy-filtered transmission electron microscopy images are acquired during the reduction of a NiO-YSZ composite in H-2 up to 600 degrees C. Temperature-resolved quantitative information about both chemistry and structure is extracted with nm spatial resol ...

Royal Society of Chemistry2014

Segregation of anion (Cl−) impurities at transparent polycrystalline α-alumina interfaces

Cécile Hébert, Paul Bowen, Marco Cantoni, Farhang Nabiei, Abhishek Tewari

Small amounts of anion impurities (e.g. Cl), which are incorporated during the synthesis of ceramic powders, can affect the properties and microstructure of the final sintered ceramic. The effect of anion impurities is a little studied and poorly understoo ...

Elsevier Sci Ltd2014

Energy loss magnetic chiral dichroism: A new technique for the study of magnetic properties in the electron microscope

Cécile Hébert

2008

Insights into image contrast from dislocations in ADF-STEM

Cécile Hébert, Emad Oveisi, Maria Chiara Spadaro

Competitive mechanisms contribute to image contrast from dislocations in annular dark-field scanning transmission electron microscopy (ADF-STEM). A clear theoretical understanding of the mechanisms underlying the ADF-STEM contrast is therefore essential fo ...

ELSEVIER SCIENCE BV2019

Channelling enhanced spectroscopy of oxygen in ringwoodite

Cécile Hébert

2005

Electron Energy Loss Spectroscopy of Rare Earth-Transition Metal Compounds and Their Hydrides ReMn2(H2) (Re=Gd,Er) Aided With Ab Initio Calculations Using WIEN2k

Cécile Hébert

2005

Cécile Hébert

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Experimental and theoretical determination of low electron energy loss spectra of Ag and Ru

Stereo-vision three-dimensional reconstruction of curvilinear structures imaged with a TEM

In-Situ Observation of Co-Ce Coated Metallic Interconnect Oxidation Combined with High-Resolution Post Exposure Analysis

Quantitative imaging of flux vortices in the type-II superconductor MgB2 using cryo-Lorentz transmission electron microscopy

Electron energy-loss spectroscopy investigations of the electron density in ErMn2 and ErMn2D2 compounds

Toward Knowledge-Based Grain-Boundary Engineering of Transparent Alumina Combining Advanced TEM and Atomistic Modeling

Leveraging Machine Learning for Advanced Nanoscale X-ray Analysis: Unmixing Multicomponent Signals and Enhancing Chemical Quantification

Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope

Magnetic circular dichroism in electron energy loss spectrometry

Enhanced Quantification for 3D Energy Dispersive Spectrometry: Going Beyond the Limitation of Large Volume of X-Ray Emission

Magnetic circular dichroism in electron microscopy

Measurements of local chemistry and structure in Ni(O)-YSZ composites during reduction using energy-filtered environmental TEM

Segregation of anion (Cl−) impurities at transparent polycrystalline α-alumina interfaces

Energy loss magnetic chiral dichroism: A new technique for the study of magnetic properties in the electron microscope

Insights into image contrast from dislocations in ADF-STEM

Channelling enhanced spectroscopy of oxygen in ringwoodite

Electron Energy Loss Spectroscopy of Rare Earth-Transition Metal Compounds and Their Hydrides ReMn2(H2) (Re=Gd,Er) Aided With Ab Initio Calculations Using WIEN2k

Measurement of magnetic circular dichroism at the FE L23 edge in the electron microscope

New prospects for low energy loss spectrometry

EELS/TEM investigation of carbon nanotubes for catalytic applications