A5018438635- Metal and Thin Film Mechanics
- Microstructure and mechanical properties
- Electrocatalysts for Energy Conversion
- Aluminum Alloys Composites Properties
- Fuel Cells and Related Materials
- Semiconductor materials and devices
- Advanced battery technologies research
- Gas Sensing Nanomaterials and Sensors
- Electronic and Structural Properties of Oxides
- Copper Interconnects and Reliability
- Nanotechnology research and applications
- History and advancements in chemistry
- Gold and Silver Nanoparticles Synthesis and Applications
- Catalysis and Oxidation Reactions
- ZnO doping and properties
- High Entropy Alloys Studies
- Luminescence Properties of Advanced Materials
- Force Microscopy Techniques and Applications
- Advancements in Solid Oxide Fuel Cells
- Magnesium Alloys: Properties and Applications
- Conducting polymers and applications
- Diatoms and Algae Research
- Diamond and Carbon-based Materials Research
- Plasmonic and Surface Plasmon Research
- Advanced materials and composites
HUN-REN Centre for Energy Research
2022-2025
Institute for Technical Physics and Materials Science
2022-2025
Eötvös Loránd University
2020-2025
Hungarian Academy of Sciences
2022
Semilab (Hungary)
2020
Ultrafine-grained and heterostructured materials are currently of high interest due to their superior mechanical functional properties. Severe plastic deformation (SPD) is one the most effective methods produce such with unique microstructure-property relationships. In this review paper, after summarizing recent progress in developing various SPD for processing bulk, surface powder materials, main structural microstructural features SPD-processed explained including lattice defects, grain...
Experimental data show that the conventional Hall-Petch relationship cannot be maintained in its original form for metals having submicrometer structures. We now propose a dislocation model which modifies Hall-Patch to provide uniform description of grain size strengthening submicron-structured face-centered cubic (f.c.c.) and solid solution alloys.
During the experimental formation of sol-gel coatings, colloid dispersions go through a drying process, and structure coatings is formed as result complex chemical, colloidal, capillary interactions. While computer simulations provide guidelines to tune even design nanomaterials synthesis, coating are hitherto unknown in literature. Based on real experiments, we establish here ReaxFF reactive force field-based molecular dynamics simulation protocol order investigate determine role conditions...
Sn-doped TiO2-carbon composites were identified as promising multifunctional supports for Pt electrocatalysts, in which the oxide component enhances resistance against corrosion and strong metal-support interactions at Pt-oxide boundary ensure high stability nanoparticles. This work is devoted to study of influence preliminary functionalization carbon on properties Pt/Ti0.9Sn0.1O2-C catalysts. The structural, compositional morphological differences between samples prepared using...
In this study, we propose simple analytical formulas for reactive sputtering technology, which can be used to assist in the selection of appropriate parameters during deposition thin films. Radio frequency (RF) sputtered alumina (Al2O3) was evaluate results. Layers with O/Al ratios ranging from 24/76 54/73 were deposited. Following effective deposition, equations Berg model describing process studied. The achieved stoichiometry and associated technological are critical importance analysis...
Design of composite support materials based on Sn-doped TiO2 and carbon is one the strategies to develop corrosion-resistant CO-tolerant Pt electrocatalysts for polymer electrolyte membrane (PEM) fuel cells. As synthesis methodology may have crucial influence structural functional properties composites, different preparation routes novel are explored compared. Ti(1-x)SnxO2–C (x: 0.1-0.3) composites with mixed oxide/carbon ratios were prepared by two sol-gel-based routes, namely (i)...
In the last three decades, several severe plastic deformation (SPD) procedures have been developed and applied in materials science to create bulk, ultrafine-grained (UFG) structures. As a consequence of SPD, not only submicron even nanometer grain sizes can be obtained, but also new boundaries with non-equilibrium structures material may formed. Therefore, both strength ductility UFG change significantly compared coarse-grained counterparts. This review is focused on unusual mechanical...
Dual DC magnetron sputtered AlCu thin films representing the whole composition range were investigated by depth-sensing indentation (DSI), transmission electron microscopy (TEM) and atomic force (AFM). Experimental results show exceptionally high hardness of ∼16 GPa in middle concentration ∼40–70 at% Cu. Indentation tests also revealed phenomena related to size-effect. At Al or Cu contents below 20 at%, well-known size effect was not observed, which can be interpreted grain boundary sliding...
The composites of transition metal-doped titania and carbon have emerged as promising supports for Pt electrocatalysts in PEM fuel cells. In these multifunctional supports, the oxide component stabilizes particles, while dopant provides a co-catalytic function. Among other elements, Sn is valuable additive. Stong metal-support interaction (SMSI), i.e., migration partially reduced species from support to surface during reductive treatment general feature TiO2-supported catalysts. order...
In a single process run, an amorphous silicon oxynitride layer was grown, which includes the entire transition from oxide to nitride. The variation of optical properties and thickness characterized by Spectroscopic Ellipsometry (SE) measurements, while elemental composition investigated Energy Dispersive Spectroscopy (EDS). It revealed that refractive index at 632.8 nm is tunable in 1.48-1.89 range varying oxygen partial pressure chamber. From data layer, typical physical parameters were...
A supersaturated Al-4.8%Zn-1.2%Mg-0.14%Zr (wt%) alloy was processed by the equal-channel angular pressing (ECAP) technique at room temperature in order to obtain an ultrafine-grained (UFG) microstructure having average grain size of about 260 nm. The hardness and microstructural characteristics, such as phase composition precipitations this UFG were studied using depth-sensing indentation (DSI), transmission electron microscopy (TEM), well non-isothermal scanning differential calorimetry...
A homogenized, supersaturated AlZnMgZr alloy was processed via severe plastic deformation (SPD) using a high-pressure torsion (HPT) technique for different revolutions at room temperature to obtain an ultrafine-grained (UFG) microstructure. The microstructure and mechanical properties of the UFG samples were then studied transmission electron microscopy (TEM), differential scanning calorimetry (DSC), tensile hardness measurements. main purpose study effect shear strain on evolution...
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High-throughput methods are extremely important in today's materials science, especially the case of thin film characterization. The micro-combinatorial method enables deposition and characterization entire multicomponent systems within a single sample. In this paper, we report application for comprehensive TEM Y-Ti-O layer system. Variable composition samples (YxTi1-xOy) were prepared by dual DC magnetron sputtering, covering (0 ≤ x 1) concentration range. structure morphology phases formed...
LaF 3 :Yb,Tm upconverting nanoparticles with overall dopant concentrations below 7 mol% were prepared by a low-cost, aqueous phase co-precipitation method having reasonably high emission intensity, aiming at e.g. anti-counterfeiting applications.
A homogenized, supersaturated Al-Zn-Mg-Zr alloy was processed by severe plastic deformation (SPD) using high-pressure torsion (HPT) technique for different revolutions at room temperature to get ultrafine-grained (UFG) microstructure. The microstructure and mechanical properties of the UFG samples were then studied transmission electron microscopy (TEM), differential scanning calorimetry (DSC), as well tensile hardness measurements. Emphasis placed on effect shear strain evolution...