A5065991182- Electron and X-Ray Spectroscopy Techniques
- Metal and Thin Film Mechanics
- Semiconductor Quantum Structures and Devices
- Semiconductor materials and interfaces
- Catalysis and Oxidation Reactions
- Catalytic Processes in Materials Science
- Ion-surface interactions and analysis
- Semiconductor materials and devices
- Bone Tissue Engineering Materials
- nanoparticles nucleation surface interactions
- Advanced Electron Microscopy Techniques and Applications
- Electronic and Structural Properties of Oxides
- Titanium Alloys Microstructure and Properties
- Intermetallics and Advanced Alloy Properties
- Aluminum Alloy Microstructure Properties
- Aluminum Alloys Composites Properties
- High Entropy Alloys Studies
- Advanced Semiconductor Detectors and Materials
- Microstructure and mechanical properties
- Advanced Materials Characterization Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Microstructure and Mechanical Properties of Steels
- Ferroelectric and Piezoelectric Materials
École Polytechnique Fédérale de Lausanne
2014-2024
AGH University of Krakow
2014-2017
École Polytechnique
1999-2007
Indian Institute of Technology Delhi
2005
Culham Centre for Fusion Energy
2005
Culham Science Centre
2005
Arizona State University
2005
Alcatel Lucent (Germany)
2002
Russian Academy of Sciences
2002
Laboratoire Léon Brillouin
1995
The main strengthening mechanism for Inconel 718 (IN718), a Ni-based superalloy, is precipitation hardening by γ' and γ″ particles. It thus essential, good alloy performance, that precipitates with the desired chemical composition have adequate size dispersion. distribution of phases their were investigated in nickel-based superalloy taking advantage new capabilities scanning transmission electron microscopy energy-dispersive X-ray spectrometry using windowless multiple detector,...
Abstract The precipitation state of an Al-4 wt% Cu-1 Mg-Ag alloy reinforced with SiC particles fabricated by squeeze casting is studied transmission electron microscopy. As a consequence interfacial reaction the characteristic phases unreinforced alloy. Ω and S′, suppressed substituted new consisting isolated nanoscaled rod-shaped precipitates θ′ plates decorated further type precipitates. These are Q-Al5Cu2Mg8Si6 phase (hexagonal = 1.035 nm c 0.405 nm), two other also containing Al, Cu. Mg...
We report on direct writing of three-dimensional freestanding nanostructures Cu by use a focused electron beam (FEB) and the metalorganic precursor hfac-Cu-TMVS. Freestanding horizontal rods were deposited over about 10 μm length consist small 2–5 nm nanocrystals dispersed in an amorphous matrix containing carbon, fluorine, silicon, oxygen. The used as support for further vertical deposits resulting tips coalesced facetted up to 100 size. almost constant deposition rate 5–6 nm/s is contrast...
Pd/PdO nanoparticles have been selectively synthesized within the SBA-15 complementary micropores located in mesopore walls, resulting a bifunctional material with stable (∼1.1 nm) and highly ordered open channels.
Atomic force microscopy reveals straight slip steps resulting from dislocation glide in the primary {100}〈110〉 system ``low mismatch'' ${\mathrm{CaF}}_{2}$/Si(111) structures. From height and spacing of steps, strain relieved by these misfit dislocations is compatible with relief tensile thermal change on cooldown. In ``high ${\mathrm{BaF}}_{2}$/${\mathrm{CaF}}_{2}$/Si(111) structures, which relieve mismatch are mobile, while 14% lattice mainly overcome sessile Burgers vectors parallel to interface.
We have analyzed the influence of two different Ti doping methods on superconducting properties bronze processed (Nb,Ta,Ti)/sub 3/Sn multifilamentary wires with identical configuration, consisting a Nb7.5wt.%Ta alloy to 14641 filaments 4.5 micrometer size embedded in an Osprey and externally stabilized by Cu. The first method introduces NbTi rods into NbTa Cu15.4Sn has been applied containing 1 2 wt.%Ti filaments, respectively. second uses added Cu15.5Sn0.25Ti bronze, while thereby...
Semi-insulating polycrystalline silicon (SIPOS) are thin SiOx films (0≤x≤2), deposited by means of low pressure chemical vapor deposition on suitable substrates (silicon or sapphire). Although SIPOS has important applications in the semiconductor and solar cell technology, its physical properties which depend strongly oxygen content x, not well known. In present contribution, as at 660 °C range 0≤x≤1 is investigated using different complementary methods, namely nuclear reaction analysis,...
MoS2 films have been prepared by RF sputtering in a planar magnetron system. Their chemical composition was analysed energy dispersive X-ray spectroscopy. The morphology and growth characteristics were examined scanning transmission electron microscopy diffraction. Correlation between process conditions, film stoichiometry has pointed out systematic variation of the experimental sputter parameters with emphasis on stable substrate temperature during deposition. It shown that precise control...
In this paper we present two methods for the quantitative measurement of thickness ferroelectric domain walls, one using high-resolution electron microscopy (HREM) and other weak beam transmission (WBTEM). These techniques can be used to determine walls at room temperature as well close paraelectric phase transition. The first method allows a direct visualization lattice distortion across wall, by measuring continuous deviation set planes with respect undistorted lattice. second consists in...
A comparative characterization of the structure normal and abnormal (osteoporotic) human lumbar thoracic vertebrae samples was carried out to reveal type possible disorder. Samples from bone fragments extracted during surgery due vertebra fractures were examined by scanning electron microscopy (SEM), conventional high resolution transmission (TEM HRTEM), X-ray energy dispersive spectroscopy (EDS). Contrary what might be expected in accordance with processes dissolution, formation...
This study presents the detailed nature of iron clusters formed on Fe3+−Nafion membranes. The catalytic these during immobilized Fenton processes was observed to be a function deposition method Fe ions Nafion. nonbiodegradable azo-dye Orange II and 2-propanol were utilized as convenient organic model compounds in photoassisted degradation processes. highest photocatalytic activity when samples prepared by ion exchange between iron(III) aqua-complexes H+ or Na+ counterions Nafion SO3- group....
Amorphous Nb2O5 thin films of three different thicknesses (10, 100, 400 nm) were deposited onto SiO2/Si substrates by reactive sputtering in an Ar–O2 plasma. Thermal treatments performed at temperatures between 500 and 1100 °C. The structural morphological evolution with temperature is shown to be dependent on the film thickness. At 600 °C, essentially crystallize TT phase. On thickest films, T phase also appears. Annealing higher progressively increases concentration show large flat grains...