Publications de Guillaume Lucas

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Acquisition of three-dimensional (3D) spectral data is nowadays common using many different microanalytical techniques. In order to proceed to the 3D reconstruction, data processing is necessary not only to deal with noisy acquisitions but also to segment ...

In this work a combination of advanced transmission electron microscopy and spectroscopy techniques enabled a statistically significant analysis of various types of few nanometer size oxides particles in Fe-14Cr-2W-O.3Ti-0.3Y(2)O(3) ferritic steel. These m ...

The ability to obtain three-dimensional (3-D) information about morphologies of nanostructures elucidates many interesting properties of materials in both physical and biological sciences. Here we demonstrate a novel method in scanning transmission electro ...

Molecular dynamics simulations were performed to estimate the dissociation energies of helium interstitials, vacancies and self-interstitial atoms from small helium-vacancy clusters. Several sets of empirical potentials have been tested and compared with a ...

structural defects induced by He implantation in GaN epilayer at high fluence (1 X 10(17) He/cm(2)) and elevated temperature (750 degrees C) have been studied by conventional and high resolution transmission electron microscopy. In addition to the planar i ...

The purpose of this study is to investigate the modes of vibration of the self-interstitial atoms and the vacancy in bcc iron and to estimate how the vibrational properties can affect the stability of these defects. The phonon density of states of the vaca ...

Small specimen test technology (SSTT) has long been an integral part of fusion materials development. Past work has led to an array of techniques that not only have provided a means of efficiently using available irradiation volumes but have also led to im ...

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 ...

We study the state of a nanometric helium bubble in bcc-iron as a function of temperature and He content using atomistic calculations. It appears that up to moderate temperatures the Fe lattice can conﬁne He to solid state, in good agreement with known sol ...

We propose an original method for the determination of the physical properties of nanometer sized helium bubbles using spectrum imaging in an energy-filtered transmission electron microscope. Helium bubbles synthesized by high fluence implantation and ther ...

Guillaume Lucas

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Multivariate statistical analysis as a tool for the segmentation of 3D spectral data

Statistical analysis of oxides particles in ODS ferritic steel using advanced electron microscopy

Tilt-less 3-D electron imaging and reconstruction of complex curvilinear structures

Stability of helium bubbles in alpha-iron: A molecular dynamics study

Helium implanted gallium nitride evidence of gas-filled rod-shaped cavity formation along the c-axis

Vibrational contributions to the stability of point defects in bcc iron: A first-principles study

The role of small specimen test technology in fusion materials development

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

Helium effects on displacement cascades in alpha-iron

Multivariate Statistical Analysis tool for the interpretation and the quantification of hyperspectral data: application to 3D EDX/FIB images

State of a pressurized helium bubble in iron

Optimization of the Data Acquisition and Processing using a Prior Knowledge of the Camera Characteristics: an EFTEM Case Study

Gentle quantitative measurement of helium density in nanobubbles in silicon by spectrum imaging

Atomistic simulation of He bubble in Fe as obstacle to dislocation