| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Nordlund, Kai
University of Helsinki
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (54/54 displayed)
- 2024Solubility of Hydrogen in a WMoTaNbV High-Entropy Alloycitations
- 2024Effect of lattice voids on Rutherford backscattering dechanneling in tungstencitations
- 2024Effect of radiation defects on the early stages of nanoindentation tests in bcc Fe and Fe-Cr alloyscitations
- 2024Unveiling the radiation-induced defect production and damage evolution in tungsten using multi-energy Rutherford backscattering spectroscopy in channeling configurationcitations
- 2023Comprehensive structural changes in nanoscale-deformed silicon modelled with an integrated atomic potentialcitations
- 2023Comprehensive structural changes in nanoscale-deformed silicon modelled with an integrated atomic potentialcitations
- 2022Simple machine-learned interatomic potentials for complex alloyscitations
- 2022Effect of radiation defects on the early stages of nanoindentation tests in bcc Fe and Fe-Cr alloyscitations
- 2021Temperature effect on irradiation damage in equiatomic multi-component alloyscitations
- 2021Origin of increased helium density inside bubbles in Ni(1-x)Fex alloyscitations
- 2021Nano-vault architecture mitigates stress in silicon-based anodes for lithium-ion batteriescitations
- 2021Modeling refractory high-entropy alloys with efficient machine-learned interatomic potentialscitations
- 2021Modeling refractory high-entropy alloys with efficient machine-learned interatomic potentials : Defects and segregationcitations
- 2021Machine-learning interatomic potential for W-Mo alloyscitations
- 2020Segregation of Ni at early stages of radiation damage in NiCoFeCr solid solution alloyscitations
- 2020Insights into the primary radiation damage of silicon by a machine learning interatomic potentialcitations
- 2019Local segregation versus irradiation effects in high-entropy alloys : Steady-state conditions in a driven systemcitations
- 2019Absence of single critical dose for the amorphization of quartz under ion irradiationcitations
- 2019Structural properties of protective diamond-like-carbon thin films grown on multilayer graphenecitations
- 2019Cascade overlap with vacancy-type defects in Fecitations
- 2019Radiation stability of nanocrystalline single-phase multicomponent alloyscitations
- 2018Absence of single critical dose for the amorphization of quartz under ion irradiationcitations
- 2018A model of defect cluster creation in fragmented cascades in metals based on morphological analysiscitations
- 2018Effects of precipitates and dislocation loops on the yield stress of irradiated ironcitations
- 2018Defect structures and statistics in overlapping cascade damage in fusion-relevant bcc metalscitations
- 2018Vaporlike phase of amorphous SiO2 is not a prerequisite for the core/shell ion tracks or ion shapingcitations
- 2017Probing electron beam effects with chemoresistive nanosensors during in situ environmental transmission electron microscopycitations
- 2017Atomic-level heterogeneity and defect dynamics in concentrated solid-solution alloyscitations
- 2017Local segregation versus irradiation effects in high-entropy alloyscitations
- 2017Thermal Oxidation of Size-Selected Pd Nanoparticles Supported on CuO Nanowirescitations
- 2016Interatomic Fe-H potential for irradiation and embrittlement simulationscitations
- 2016Ru/Al Multilayers Integrate Maximum Energy Density and Ductility for Reactive Materialscitations
- 2016Optimizing the sputter deposition process of polymers for the Storing Matter technique using PMMAcitations
- 2016Dependence of short and intermediate-range order on preparation in experimental and modeled pure a-Sicitations
- 2015The as-deposited structure of co-sputtered Cu-Ta alloys, studied by X-ray diffraction and molecular dynamics simulationscitations
- 2015Molecular dynamics investigation of the interaction of dislocations with carbides in BCC Fecitations
- 2015Surface segregation in chromium-doped NiCr alloy nanoparticles and its effect on their magnetic behaviorcitations
- 2015Ion-solid interactions at the extremes of electronic energy losscitations
- 2015Modification of Pt/Co/Pt film properties by ion irradiationcitations
- 2014Experimental and Numerical Study of Submonolayer Sputter Deposition of Polystyrene Fragments on Silver for the Storing Matter Techniquecitations
- 2014Effect of ion irradiation on structural properties of Cu64Zr36 metallic glasscitations
- 2013Radiation effects in nuclear materialscitations
- 2009From multiply twinned to fcc nanoparticles via irradiation-induced transient amorphizationcitations
- 2009Fast three dimensional migration of He clusters in bcc Fe and Fe-Cr alloyscitations
- 2009Modeling of film growth by cluster depositioncitations
- 2009Low energy cluster deposition of nanoalloyscitations
- 2009Amorphization of Ge nanocrystals embedded in amorphous silica under ion irradiationcitations
- 2008Atomistic simulation of the interface structure of Si nanocrystals embedded in amorphous silicacitations
- 2007Hydrocarbon radicals interaction with amorphous carbon surfacescitations
- 2007Radiation damage in WC studied with MD simulationscitations
- 2006Swift chemical sputtering of covalently bonded materialscitations
- 2006Energetics, structure, and long-range interaction of vacancy-type defects in carbon nanotubescitations
- 2006Ultrafast dynamics of Ni+-irradiated and annealed GaInAs/InP multiple quantum wellscitations
- 2006H, He, Ne, Ar-bombardment of amorphous hydrocarbon structurescitations
Places of action
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article
Surface segregation in chromium-doped NiCr alloy nanoparticles and its effect on their magnetic behavior
Abstract
cited By 11 ; International audience ; Surface segregation designates the phenomenon of variation in chemical composition between the surface and the bulk of an alloy, which can have a beneficial or detrimental effect on its physical and chemical properties. This is even more pronounced in nanoalloys, i.e., alloy systems comprised of nanoparticles, with significant surface-to-volume ratios. In this case study we demonstrate the element-specific Cr segregation in Ni-rich NiCr alloy nanoparticles and nanogranular films grown by gas-phase synthesis methods. In situ annealing measurements (300-800 K), performed under vacuum using aberration-corrected environmental transmission electron microscopy (E-TEM), and vibrating sample magnetometry (VSM) revealed progressive Cr segregation with annealing temperature and subsequent complete transformation into core-satellite structures at 700 K. Simultaneously, atomistic computer simulations (molecular dynamics (MD) and Metropolis Monte Carlo (MMC)) elucidated the resultant structures, explaining the driving force behind segregation energetically. Most importantly, we emphasize the significant effects of Cr segregation on magnetic properties, namely, (i) the highly nonsaturated M-H loops (below the Néel temperature of antiferromagnetic Cr) with reduced coercivities and (ii) the uncompensated high Curie temperatures, T C , compared to the NiCr bulk, which approach bulk Ni values upon annealing. Both are clear evidence that the distribution of Cr in the nearest-neighbor shells of Ni atoms differs from that of the bulk NiCr alloy, reconfirming our structural findings.