A5089406569- Iron oxide chemistry and applications
- Metallic Glasses and Amorphous Alloys
- Magnetic Properties and Synthesis of Ferrites
- Microstructure and Mechanical Properties of Steels
- Diamond and Carbon-based Materials Research
- Magnetic Properties and Applications
- Microstructure and mechanical properties
- Metal and Thin Film Mechanics
- Magnetic properties of thin films
- Intermetallics and Advanced Alloy Properties
- Advanced Materials Characterization Techniques
- Ion-surface interactions and analysis
- Advanced materials and composites
- Magnetic Properties of Alloys
- Metallurgical and Alloy Processes
- Shape Memory Alloy Transformations
- Carbon Nanotubes in Composites
- Metal Alloys Wear and Properties
- High-Temperature Coating Behaviors
- Heusler alloys: electronic and magnetic properties
- Minerals Flotation and Separation Techniques
- Laser-Ablation Synthesis of Nanoparticles
- Muon and positron interactions and applications
- Aluminum Alloy Microstructure Properties
- Magnesium Oxide Properties and Applications
Czech Academy of Sciences, Institute of Physics of Materials
2016-2025
Central European Institute of Technology
2011-2024
Czech Academy of Sciences
1993-2022
Central European Institute of Technology – Masaryk University
2020
Dong-A University
2012
Palacký University Olomouc
2006-2010
Brno University of Technology
2010
Czech Academy of Sciences, Institute of Physics
2010
Techtra (Poland)
2010
Czech Academy of Sciences, Institute of Inorganic Chemistry
2008
We present experimental data showing that the equiatomic CrMnFeCoNi high-entropy alloy undergoes two magnetic transformations at temperatures below 100 K while maintaining its fcc structure down to 3 K. The first transition, paramagnetic spin glass, was detected 93 and second transition of ferromagnetic type occurred 38 Field-assisted cooling resulted in a systematic vertical shift hysteresis curves. Strength direction associated magnetization bias proportional strength field shows linear...
The fabrications of iron oxides nanoparticles using co-precipitation and gadolinium water in oil microemulsion method are reported this paper. Results detailed phase analysis by XRD Mössbauer spectroscopy discussed. revealed that the crystallite size (mean coherence length) (mainly γ-Fe2O3) Fe2O3 sample was 30 nm, while Fe2O3/SiO2 where ε-Fe2O3 dominated it only 14 nm. Gd/SiO2 were found to be completely amorphous, according XRD. samples showed various shapes hysteresis loops different...
Fresh precipitates, deposited from seepage waters of complex-ore mine-tailing impoundment at Zlaté Hory, Czech Republic, were characterized by means X-ray diffraction, transmission electron microscopy, low temperature and in-field Mössbauer spectroscopy, Brunauer−Emmett−Teller surface area measurements. The prevailing phases (∼96 wt %) found in precipitates are poorly crystalline, 2−6 nm sized two-line ferrihydrite, forming globular aggregates about 150 diameter, rimmed acicular irregular...
Using a device for thermogravimetric analysis, dynamic study of thermally induced solid-state transformations FeC2O4·2H2O in the atmosphere allowing full participation gaseous products (CO, CO2, H2O) reaction system was carried out. Solid phases formed at various temperatures between 25 and 640 °C were identified characterized using 57Fe Mössbauer spectroscopy, TG XRD. Up to 230 °C, evolution two molecules water crystallization takes place. Superparamagnetic nanoparticles magnetite (Fe3O4)...
We present a new, easily scalable method for the deposition of nanocrystalline hematite photoelectrodes based on spin-coating mixed solution containing tin(II) and iron(III) chlorides followed by thermal treatment. Our facile approach does not require any additional film-forming organic species allows simple control photoelectrochemical performance electrode adjusting degree tin doping. When annealed at 650 °C strong increase in water oxidation photocurrent is observed with increasing...
Nickel ferrite NiFe2O4 is a typical soft magnetic with high electrical resistivity used as frequency material. Neodymium (Nd3+) doped materials were fabricated using solid state reaction. The properties of the obtained material investigated by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Fourier-Transform Infrared Spectroscopy (FT-IR), measurements on SQUID and Mössbauer spectroscopy. It was found that consists two different phases: Nd3+ NdFeO3. ions occupy cation sites...
We have performed a quantum-mechanical study of series stoichiometric Ni2MnSn structures focusing on pressure-induced changes in their magnetic properties. Motivated by the facts that (i) our calculations give total moment defect-free higher than experimental value 12.8% and (ii) state is predicted to be more sensitive hydrostatic pressures seen measurements, focused role point defects, particular Mn-Ni, Mn-Sn Ni-Sn swaps Ni2MnSn. For most defect types we also compared states with both...
Thermally induced reduction of amorphous Fe2O3 nanopowder (2–3 nm) with nanocrystalline Mg (∼20 under a hydrogen atmosphere is presented as novel route to obtain α-Fe and Fe3O4 magnetic nanoparticles dispersed in MgO matrix. The phase composition, structural properties, size morphology the were monitored by x-ray diffraction, 57Fe Mössbauer spectroscopy at temperatures 24–300 K, transmission electron microscopy measurements. Spherical magnetite prepared reaction temperature 300 °C revealed...
Solid-state dewetting is used to fabricate supersaturated, submicron-sized Au-Ni solid solution particles out of thin Au/Ni bilayers by means a rapid thermal annealing technique. Phase separation in such studied with respect their equilibrium crystal (or Wulff) shape subsequent at elevated temperature. It found that {100} faceting planes the equilibrated are enriched Ni and {111} faces Au. Both phases considered quantum-mechanical calculations combination an error-reduction scheme was...