A5053518353- Microstructure and Mechanical Properties of Steels
- Magnetic Properties and Applications
- Magnetic Properties of Alloys
- Magnetic properties of thin films
- Hydrogen embrittlement and corrosion behaviors in metals
- Intermetallics and Advanced Alloy Properties
- Metallurgical and Alloy Processes
- High-Temperature Coating Behaviors
- High Entropy Alloys Studies
- Rare-earth and actinide compounds
- Metallic Glasses and Amorphous Alloys
- Crystallography and Radiation Phenomena
- Microstructure and mechanical properties
- Metal Alloys Wear and Properties
- Advanced Materials Characterization Techniques
- Fusion materials and technologies
- High Temperature Alloys and Creep
- Iron oxide chemistry and applications
- Heusler alloys: electronic and magnetic properties
- Advanced materials and composites
- High-pressure geophysics and materials
- Metallurgical Processes and Thermodynamics
- Advanced Chemical Physics Studies
- Additive Manufacturing Materials and Processes
- Material Properties and Failure Mechanisms
AGH University of Krakow
2015-2024
Jagiellonian University
2024
University of Vienna
2010
TU Wien
2006
Institute of Nuclear Physics
1997
Institute of Metallurgy and Materials Science
1994
A review is presented on physical properties of the sigma-phase in Fe-Cr and Fe-V alloy systems as revealed both with experimental -- mostly Mossbauer spectroscopy theoretical methods. In particular, following questions relevant to issue have been addressed: identification sigma determination its structural properties, kinetics alpha-to-sigma sigma-to-alpha phase transformations, Debye temperature Fe-partial phonon density states, Curie magnetization, hyperfine fields, isomer shifts electric...
Distribution of Cr atoms in Fe_{100-x}Cr_x alloys with x \le 25 within the first two coordination shells, 1NN-2NN, around probe 57Fe was studied by means M\"ossbauer Spectroscopy. Clear evidence found that distribution is characteristic a given atomic configuration. Only configurations situated 2NN exhibit quiasi-random distribution, while those present 1NN shell and both shells evidently not random showing clastering or anticlastering features. These findings are novel much more complete...
Benefits emerging from applying high-entropy ceramics in Li-ion technology are already well-documented a growing number of papers. However, an intriguing question may be formulated: how can the multicomponent solid solution-type material ensure stable electrochemical performance? Utilizing example nonequimolar Sn-based Sn0.8(Co0.2Mg0.2Mn0.2Ni0.2Zn0.2)2.2O4 spinel oxide, we provide comprehensive model explaining observed very good cyclability. The exhibits high specific capacity above 600 mAh...
Abstract Magnetic properties of microcrystalline σ‐Fe 100– x Cr (45 ≤ 50) alloys were investigated with Mössbauer‐effect and magnetization measurements performed as a function temperature external magnetic field up to 15 T. The Curie temperature, T C , the average moment per Fe atom, 〈 μ 〉, which determined, decrease linearly ; former at rate ∼7 K/at% latter 0.033 B /at%. 〉‐values determined are significantly larger than those in literature. characteristic features curves that they (a) do...
Multicomponent, transition-metal selenides characterized by TM3Se4 stoichiometry, and monoclinic pseudospinel structure were recently reported as promising catalysts for water-splitting processes. However, the initial data indicate that simple increase in number of composing elements might not be sufficient to maximize their performance, with systematic screening different regions multicomponent phase diagrams proving most effective approach. Thus, this work, a series highly conductive...
Composite materials with the composition (100-x)Cu1.3Mn1.7O4/xLaNi0.6Fe0.4O3 (CMxLNF, where: x= 5, 10, 15, 20, 30, 40 and 50 wt%) were evaluated as possible coating for SOFC/SOEC metallic interconnects. The introduction of LaNi0.6Fe0.4O3 into spinel matrices improved electrical conductivity compared to pure Cu1.3Mn1.7O4. measured Seebeck coefficient values indicate that carrier concentration increased content, yet activation energy carriers' mobility decreased. Extensive structural...
Experimental and theoretical studies, of the Fe-partial phonon density states (PDOS) for ${\mathrm{Fe}}_{52.5}{\mathrm{Cr}}_{47.5}$ alloy having $\ensuremath{\alpha}$ $\ensuremath{\sigma}$ phases were carried out. The former using nuclear resonant inelastic x-ray scattering method, latter with direct one. Characteristic features PDOS, which distinguish one phase from other, revealed successfully reproduced by theory. Data pertinent to dynamics such as Lamb-M\"ossbauer factor, $f$, kinetic...
Systematic experimental studies (vibrating sample magnetometry) supported by theoretical calculations (electronic structure spin self-consistent Korringa-Kohn-Rostoker Green's function method) were performed on a series of intermetallic sigma-phase Fe100−xRex (x = 43–53) compounds. All investigated samples exhibit magnetism with an ordering temperature ranging between ∼65 K for x 43 and ∼23 53. The was revealed to be itinerant identified as spin-glass (SG) possibly having re-entrant...
In situ and conventional room temperature 57Fe-site Mössbauer spectroscopy (MS) were used to study the phase separation process in Fe-Cr alloy system. It was shown that MS is well able distinguish between (i) nucleation growth (ii) spinodal decomposition, two mechanisms held responsible for separation. The Fe-rich branch of line located at 80.8⩽x⩽84 at.% Fe T = 415 °C. also saturation average hyperfine field cannot be taken as an indicator termination process. kinetics dramatically depends...
The electronic structure of complex $\ensuremath{\sigma}$-phase ${\text{Fe}}_{100\ensuremath{-}x}{\text{V}}_{x}$ compounds with $33.3\ensuremath{\le}x\ensuremath{\le}60.0$ was calculated the charge self-consistent Korringa-Kohn-Rostoker method. chemical disorder effects appearing in real samples were accounted for by considering most representative ordered approximants. Bearing mind neutron-diffraction data on atom occupancy over nonequivalent lattice sites, hyperfine parameters finally...
Neutron powder diffraction was used to study the distribution of Co and Cr atoms over different lattice sites as well parameters sigma-phase compounds 100 − x with = 57.0, 62.7 65.8. From diffractograms recorded in temperature range 4.2–300 K it found for five crystallographically independent that A (2 a ) D (8 i are predominantly occupied by atoms, while B (4 f ), C E j mainly accommodate atoms. The c exhibit linear dependencies, expansion coefficients ranges 4.2–100 100–300 K.
The electronic structure of a σ-FeCr compound in paramagnetic state was calculated for the first time terms isomer shifts and quadrupole splittings. former were using charge self-consistent Korringa-Kohn-Rostoker (KKR) Green's function technique, while latter estimated from an extended point model. quantities combined with recently measured site occupancies successfully used to analyze Mössbauer spectrum recorded at room temperature only five fitting parameters namely background, total...