A5034908029- Quasicrystal Structures and Properties
- X-ray Diffraction in Crystallography
- Mineralogy and Gemology Studies
- Geology and Paleoclimatology Research
- Microstructure and mechanical properties
- French Urban and Social Studies
- Metallic Glasses and Amorphous Alloys
- Aluminum Alloy Microstructure Properties
- Geological formations and processes
- Geological Modeling and Analysis
- Soil erosion and sediment transport
- Nanocluster Synthesis and Applications
- Intermetallics and Advanced Alloy Properties
- Aeolian processes and effects
- Landslides and related hazards
- nanoparticles nucleation surface interactions
- Coastal and Marine Dynamics
- Social Sciences and Governance
- Theoretical and Computational Physics
- Metallurgical and Alloy Processes
- Geographic Information Systems Studies
- Education, sociology, and vocational training
- Geochemistry and Geologic Mapping
- Satellite Image Processing and Photogrammetry
- Cryospheric studies and observations
Jožef Stefan Institute
2016-2024
Jožef Stefan International Postgraduate School
2016-2024
Université de Sherbrooke
2004-2022
Centre National de la Recherche Scientifique
2012-2022
Université de Lorraine
2012-2022
Institut Jean Lamour
2012-2022
Centre d'Études et de Recherches sur les Qualifications
2013-2020
Associated Research (United States)
2017
École Nationale Supérieure des Mines de Paris
2000-2011
École Nationale Supérieure des Mines de Nancy
2000-2011
An improved version of the Hesse-Rubartsch method is described. This applied, together with an adapted peak shape, to evaluation hyperfine field distribution in amorphous Fe79.5Si1.5B19 alloy at room temperature. The detailed structure this discussed.
Perfect single grains of the AlPdMn icosahedral phase have been used for structure determination by X-ray and neutron diffraction. Owing to large difference between scattering factors, information is gained on atomic positions three elements. A model proposed as deduced from a six-dimensional (6D) Patterson analysis. Six different hypersurfaces are located node body-centre sites 6D lattice. The superstructure that leads face-centred lattice mainly due strong chemical ordering, all palladium...
Abstract The discovery of quasicrystals by Shechtman et al . in 1982–84 has revolutionised our understanding crystals and order solids. was awarded a Nobel Prize Chemistry 2011 to recognize the importance this breakthrough. Soon after initial publication, patent filed author secure potential application these new materials fabrication low-stick surfaces adapted industrial production cooking utensils. Quite few more patents followed, covering several areas technological relevance such as low...
Abstract The occurrence of a reversible phase transformation from rhombohedral crystalline structure to perfect quasicrystalline state chemical composition Al63·5Fe12·5Cu24 has been studied by transmission electron microscopy. Both direct in situ heating experiments and thermal treatments bulk dodecahedral particles have carried out order characterize the various intermediate stages this its reversibility. most spectacular can be considered as modulated which, depending on treatment, appears...
Using both powder and single crystal samples, neutron X-ray diffraction data were obtained with quasicrystals of the AlLiCu system. Isotopic substitution on Li Cu atomic sites allowed amplitudes phase shift partial structure factors to be determined. a high-dimensional crystallography approach results in phases reconstructed densities calculated. The six-dimensional periodic appeared as primitive hypercubic lattice mid-edge vertex Al/Cu surfaces plus bodycentre site. major drawbacks...
Quasicrystals uncovered in aluminium alloys are still a matter of intense research regarding their structure which does not obey the rules classical crystallography. Today, they also offer new challenge relation with specific electronic properties and surprising mechanical behaviour. These summarized this review light some structural data. The technological relevance these results is briefly advocated.
The structure of the liquid Al 80 (Mn x (FeCr) 1-x ) 20 alloys has been studied using neutron diffraction and substitution between Mn atoms σ-FeCr mixture. We have checked that this subtitution is isomorphous by performing four measurements on different mixtures with x=1, 0.639, 0.304 0. Bhatia-Thornton as well Faber-Ziman partial factors determined in particular, certain features S NN function distribution transition metal atom pairs point out to existence a well-defined topological...
We present high-resolution electron microscopy and x-ray diffraction studies of the Al63Cu17.5Co17.5Si2 alloy at room temperature. The sample is found periodic in one direction c presents tenfold symmetry l = 0 plane perpendicular to this direction. two complementary techniques show that not a 2D quasi-crystalline state but microcrystalline state, which restores overall pattern. On basis our results, we discuss some relationships could exist between phases.
Abstract For years, the community working on quasicrystals in many countries world was expecting ultimate recognition of its contribution to advancement crystal chemistry, solid‐state physics, mathematics, and other fields. Nearly thirty years after initial discovery, it finally awarded October 2011 Prof. Danny Shechtman by Nobel Committee for Physics Chemistry. Many, most often independent, achievements contributed this success. The purpose article is chronicle role played applications...
In a combined scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and density functional theory (DFT) study of the surface Al${}_{13}$Co${}_{4}$(100), all techniques have found that after annealing to 1165 K, structure is consistent with dense Al-rich plane Co atom depletion. Various models were considered, in LEED study, best agreement was model consists terminating planes no atoms, otherwise similar bulk puckered layers. This also be stable DFT study. The best-fit...
We have investigated the structure of ${\mathrm{Al}}_{13}{\mathrm{Fe}}_{4}(010)$ surface using both experimental and ab initio computational methods. The results indicate that topmost layers correspond to incomplete puckered ($P$) planes present in bulk crystal structure. main building block corrugated termination consists two adjacent pentagons Al atoms, each centered by a protruding Fe atom. These motifs are interconnected via additional atoms referred as ``glue'' which partially desorb...
We examined the effect of Al59Cu25Fe13B3 (at.%) quasicrystalline (QC) reinforcement particles on mechanical and surface properties a polymer-matrix composite by applying technical polymer polyphthalamide (PPA). The observed increase in tensile Young’s modulus ranged from 1810 MPa for pure to 4114 with QC filling 35 vol.%. elongation at fracture decreased fraction, being equal 16.9% dropping 4.8% same trend was noticeable flexural modulus, which 100 125.5 vol.% QC. It found that strength led...
Un bilan des connaissances de la dynamique l’érosion côtière dans l’estuaire et le golfe du Saint-Laurent montre que recul littoral les formations meubles est très important, variant généralement entre 0,5 2 m/an. Les données indiquent une accélération récente phénomène, ce qui va sens tendance mondiale appréhendée contexte changements climatiques. Il semble côtes à marais maritimes soient plus sensibles, certains schorres supérieurs ayant déjà disparu au cours dernière décennie. Cela...