A5113578797- Luminescence Properties of Advanced Materials
- Crystal Structures and Properties
- Fullerene Chemistry and Applications
- Carbon Nanotubes in Composites
- Graphene research and applications
- Mineralogy and Gemology Studies
- X-ray Diffraction in Crystallography
- Glass properties and applications
- Magnetic and transport properties of perovskites and related materials
- Silicon Nanostructures and Photoluminescence
- Advanced Semiconductor Detectors and Materials
- High-pressure geophysics and materials
- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Catalytic Processes in Materials Science
- Chalcogenide Semiconductor Thin Films
- Optical and Acousto-Optic Technologies
- Gas Sensing Nanomaterials and Sensors
- Solid-state spectroscopy and crystallography
- Quantum Dots Synthesis And Properties
- Nanotechnology research and applications
- Photonic Crystals and Applications
- Phase-change materials and chalcogenides
- Photorefractive and Nonlinear Optics
- Microwave Dielectric Ceramics Synthesis
V. N. Karazin Kharkiv National University
2024
Georgi Nadjakov Institute of Solid State Physics
2024
Osipyan Institute of Solid State Physics RAS
2012-2023
Russian Academy of Sciences
1996-2015
National Academy of Sciences of Ukraine
1995
Our experiments with nanocrystalline scintillating rare earth oxides and fluorides have shown that in some cases nanoscopic dimensions provide essential improvement of the most important scintillation parameters: light yield, kinetics scintillations, radiation hardness, etc. We found range from 20 to 100-nm oxide fluoride particles there are 3 types layered structures: expanded exterior layer, changed phase structure, chemical composition. These structures can strongly influence cause an...
Abstract Magnetic materials are usually divided into two classes: those with localised magnetic moments and itinerant charge carriers. We present a comprehensive experimental (spectroscopic ellipsomerty) theoretical study to demonstrate that these types of magnetism do not only coexist but complement each other in the Kondo-lattice metal, Tb 2 PdSi 3 . In this material carriers interact large Tb(4f) states, forming complex lattices at low temperatures, which we associate self-organisation...
Infrared reflectivity spectra of a ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4+\mathrm{x}}$ single crystal have been studied over spectral range 50--5500 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$. Anisotropy the has observed, indicating strong anisotropy high-frequency conductivity crystal. New lines found in optical-phonon excitation spectra. A classification lattice optical vibrations proposed. Spectral reconstruction observed phonon region 370 and 445 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$...
Sorption of Ag, Cu, Pb, Cd, Fe and Mg cations on multi-walled carbon nanotubes (MWCNTs) produced by CVD method has been investigated in static dynamic modes. Correlation between synthesis temperature MWCNTs their sorption capacity demonstrated. It was shown that concentration carbonyl groups the oxidized surface MWNTs increases with decrease at same oxidation conditions. Maximal capacities have synthesized 400°C then treated HNO3 concentrated 120°C. may be explained formation more defective...
The synthesis, morphology, structural and optical characteristics of SiC/C nanocomposites with an inverse opal lattice have been investigated. samples were prepared by thermochemical treatment matrices filled carbon compounds which was followed silicon dioxide dissolution. studied electron microscopy, x-ray diffraction, photoluminescence, IR Raman scattering spectroscopy. microscopy data revealed a highly porous periodic structure three-dimensional replica the voids initial lattice....
Abstract Carbon single‐wall nanotubes (SWNTs) were loaded with 5.4 wt.% H by exposing to a hydrogen pressure of 50 kbar at 500°C. Investigation the optical transmission spectra showed that hydrogenation significantly suppressed high‐frequency conductivity σ free carries in SWNTs and also eliminated band‐to‐band electronic transitions. Instead, narrow line C‐H stretching vibrational mode appeared 2845 cm−1. A gradual removal from hydrogenated vacuum annealing T≥500°C resulted an approximately...
Optical transmission spectra of C60Hx with x in the range 36–60 show an increase molecular symmetry at = 60. Hydrogenated fullerenes C60 were synthesized a hydrogen pressure 50±5 kbar and temperatures up to 773 K. Combination vibration modes C60H60 and, for example, C60H48 may explain emission absorption some interstellar circumstellar clouds.