A5029335484- Microstructure and Mechanical Properties of Steels
- Semiconductor materials and interfaces
- Hydrogen embrittlement and corrosion behaviors in metals
- Silicon Carbide Semiconductor Technologies
- Graphene research and applications
- Magnetic Properties and Applications
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Material Properties and Failure Mechanisms
- Advancements in Battery Materials
- Carbon Nanotubes in Composites
- Boron and Carbon Nanomaterials Research
- Coal Properties and Utilization
- Diamond and Carbon-based Materials Research
- Luminescence Properties of Advanced Materials
- Catalytic Processes in Materials Science
- Solid-state spectroscopy and crystallography
- Silicon Nanostructures and Photoluminescence
- Silicon and Solar Cell Technologies
- Supercapacitor Materials and Fabrication
- Advanced ceramic materials synthesis
- Phase-change materials and chalcogenides
- Shape Memory Alloy Transformations
- Glass properties and applications
- Coal and Coke Industries Research
V.E. Lashkaryov Institute of Semiconductor Physics
2012-2023
National Academy of Sciences of Ukraine
2001-2023
Institute of Software Systems
1993-2010
Ruhr University Bochum
2006
Institute of Semiconductor Physics
1979-1995
Institute of Semiconductors
1974-1989
Electron-spin resonance was studied in the ${\mathrm{Cr}}_{21}$${\mathrm{Ni}}_{16}$${\mathrm{Mn}}_{7}$ and ${\mathrm{Cr}}_{20}$${\mathrm{Ni}}_{16}$${\mathrm{Mn}}_{6}$ austenites with different content of nitrogen carbon. Measurements were made temperature region 10--300 K. Temperature dependences obtained for absorption-derivative signal parameters such as intensity I(T), width \ensuremath{\Delta}H(T), asymmetry parameter R(T). Theoretical analysis shape revealed that its dependence is...
The effect of nitrogen and carbon on the electronic magnetic properties iron-base Fe56Cr18Ni16Mn10 3d-alloy with f.c.c. lattice (austenite) is studied by means resonance. It shown that electron state density Fermi surface in austenite one order magnitude higher than one. Based measurements temperature dependence g-factor existence superparamagnetic clusters stated, latter being obviously substitutional solutes. Signs values exchange interaction between conduction electrons other subsystems...
Abstract The total structural energy per primitive lattice cell, density of electron states, spatial distribution electrons and elastic modulus in fcc Fe–H solid solutions are studied using the functional theory Wien2k program package. It is shown that hydrogen increases states at Fermi level. conduction increased vicinity atoms, which suggests latter migrate over crystal surrounded by clouds electrons. Calculations show decreases shear c 44 . consequences for mechanical properties...
Hydrogen effects in austenitic steels are studied using the ab initio calculations of electronic structure, conduction electron spin resonance, internal friction, and mechanical tests. It is shown that hydrogen-caused elastic shielding dislocations not sufficient for interpretation hydrogen-enhanced localized plasticity (HELP). Similar hydrogen nitrogen opposite effect carbon on dislocation mobility demonstrated, which cannot be explained within framework continuum mechanics. An...
Using methods of the scanning electron microscopy, Raman scattering light(RS), and paramagnetic resonance (EPR), consistent research local structure magnetic features different types raw coal samples from Donetsk basin is carried out. It established that ratio main peak intensities RS spectrum D G inversely related to volatile substance amount Vdaf in samples. The study kinetic behavior EPR line width hydrogen, oxygen, methane sorption-desorption processes each sample helped determine...
Purpose is to analyze influence mechanisms of physicochemical coal properties on the degree outburst risk as well desorption kinetics methane. Methods scanning electron microscopy (SEM), paramagnetic resonance (EPR), nuclear magnetic (NMR), infrared spectroscopy (IR) and Raman scattering (RS) have been applied. The samples taken from Donbas seams varying in their ranks (i.e. carbonization degree). Findings. It has identified that context hazardous zones, ratio between integral intensity...
The influence of the substitutional atoms Cr, Mn, Ni, Cu, Mo in iron-based alloys on stability crystalline fcc structure and change electron state density at Fermi surface are studied by means conduction spin resonance (CESR). temperature dependence CESR g-factor its integral intensity is measured analysed relation to theoretical predictions. It shown that Mn decrease iron, whereas Ni Cu increase it. study singles out contributions three subsystems (conduction s electrons, localized isolated...
Some results of ab initio calculations and experimental studies the C, N C+N effect on electron structure austenitic CrMn steels are presented. It is shown that total energy per atom decreases due to alloying in sequence carbon→nitrogen→carbon+nitrogen, which suggests a corresponding increase thermodynamic stability austenite. Alloying with nitrogen nitrogen+carbon increases density states at Fermi level comparison interstitial‐free carbon‐alloyed steel. Measurements conduction spin...
Abstract The high chromium content of stainless steel impairs the interstitial solubility carbon in austenite at solution annealing or hardening temperature. Replacing by nitrogen improves which is raised most, if and are added jointly. Respective thermodynamic equilibrium calculations have led to a new group austenitic martensitic steels as well thermochemical surface treatment, that make use C + N concept intensively strengthen with about 0.5 1 mass% these interstitials. Pressurized...
Newly synthesized undoped and iron-doped nanoscale powders of KNbO3 are investigated using magnetic resonance static magnetization methods in order to determine how the crystal size doping affect structure defects material properties. Although bulk crystals nonmagnetic, powder with average particle 80 nm exhibits The ferromagnetic signal curve registered on thoroughly analyzed. It is concluded that appearance defect driven ferromagnetism due nano-size particles. This effect disappears sizes...
Abstract A Hamiltonian is derived for the exchange interaction between paramagnetic ions and electrons from bands Γ 6 , 7 8 that result of splitting Γ′ 15 25 by spin‐orbit arbitrary intensity Δ so in semiconductors with cubic lattices. It shown that, being sufficiently large, each splitted subzone Heisenberg form. Formulas are numerical estimations carried out constants; relation latter to crystal band structure discussed. The sign difference which was discovered experimentally earlier...