A5045471903- Geological and Geochemical Analysis
- Crystal Structures and Properties
- Geochemistry and Geologic Mapping
- Nuclear materials and radiation effects
- Mineralogy and Gemology Studies
- Graphene research and applications
- Solid-state spectroscopy and crystallography
- Astro and Planetary Science
- High-pressure geophysics and materials
- Cultural Heritage Materials Analysis
- Geotechnical and Geomechanical Engineering
- Luminescence Properties of Advanced Materials
- Glass properties and applications
- Advanced Condensed Matter Physics
- Microwave Dielectric Ceramics Synthesis
- Clay minerals and soil interactions
- Spectroscopy Techniques in Biomedical and Chemical Research
- X-ray Diffraction in Crystallography
- Archaeology and ancient environmental studies
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Crystallization and Solubility Studies
- Diamond and Carbon-based Materials Research
- Planetary Science and Exploration
- Gas Sensing Nanomaterials and Sensors
Ural Federal University
2018-2024
Zavaritsky Institute of Geology and Geochemistry
2018-2024
Kola Science Centre
2023-2024
Institute of Physics and Technology
2024
Abstract The application of statistical methods to Raman spectroscopy is due the need analyse arrays poorly resolved mineral spectra having low symmetry, large unit cells, and so forth. For diagnosis spectral changes under influence an external factor, as well for determination critical values, treatment spectrum profile provide more accuracy than a peak‐fitting procedure. following algorithms calculating ξ parameters are used parameterise I(ν,T) temperature‐dependent spectra: Pearson...
Here, we report results of the investigation lattice dynamics sylvanite mineral AuAgTe4 in a wide temperature and pressure range by Raman spectroscopy, together with first-principle calculations. At ambient pressure, experimental spectrum agrees well calculation data. The behavior phonon self-energies (frequencies linewidths) are described an anharmonic mechanism imply negligible contributions electron–phonon interaction at low temperatures. A structural phase transition was recorded 4–6...
Abstract In situ thermo‐Raman spectroscopy is used to study a single crystal of natural orthorhombic cubanite from the Talnakh copper‐nickel sulfide deposit (Norilsk, Russia). The dependence wavenumbers and FWHMs vibrational modes on temperature, including → isocubanite phase transition region, studied in range 83–873 K. For first time, polarized Raman spectra have been interpreted according ab initio calculations performed using density functional theory (DFT) implemented VASP package....
The study provides novel insights into the crystal–chemical and optical characteristics of frankamenite. Frankamenite belongs to a special group (canasite group) complex alkaline Ca-(K)-(Na) silicates, it was found in charoitites from only known location, Murun Massif, Eastern Siberia, Russia. crystal–chemical, vibrational, properties frankamenite were investigated by combining electron probe microanalysis (EPMA), single-crystal X-ray diffraction (SCXRD), infrared (IR) absorption, Raman,...
CaMoO4- and SrMoO4-based scheelite-type phases are noteworthy functional materials, whose properties strongly correlate with their structure. This work is devoted to La- or Bi-doped molybdates. The purpose of the present study quantify effect isolated electron pairs bismuth on distortion structure related properties. Conventional solid-state technology was used for synthesis (Ca/Sr)1–3xLa2xФxMoO4 Sr1–3xBi2xФxMoO4, (0.025≤ x ≤ 0.275). investigated by X-ray powder diffraction Raman...
Abstract The study of the Durango fluorapatite single crystal was carried out by in situ ThermoRaman polarization spectroscopy temperature range 80–870 K. use polarized radiation made it possible to behavior all vibrational modes detail, excluding their superposition at elevated temperatures. analysis anharmonicity vibrations has been out; most strongly interacting anharmonic responsible for structural rearrangements have determined. Those include, first all, ν 1 symmetric stretching with A...
Raman spectroscopy together with density functional calculations were used to study lattice dynamics in a layered honeycomb cobaltite Na$_3$Co$_2$SbO$_6$, which can host field-induced phase related the Kitaev physics. We show that there develops an additional mode well above Neel temperature (at $\approx 200$K) at 525 cm$^{-1}$, origin be electronic excitation one of $j_{3/2}$ doublets. Moreover, our theoretical demonstrate highest frequency intensive oxygen vibrations is very sensitive type...
Research subject . Understanding the structure and thermodynamic properties of sulfide minerals is important for studying paragenesis formation on Earth in space, as well analyzing technological issues processing ores polysulfide product concentrates. There a lack experimental theoretical information many representatives Cu-Fe-S Cu-Fe-Se systems. Aim To synthesize crystals systems at lowest possible temperatures subsequent study their physical properties, while solving main problem materials...
Research subject . Zircon grains from diamond placers of the Molodo and Ebelyakh rivers Yakut Arctic. Aim To study indicator characteristics zircon to determine sources diamonds ways their transfer placers; analyze optical-spectroscopic isotope-geochemical parameters grains, microelemental, U-Pb, Lu-Hf isotope composition. Materials methods A LA-ICP-MS analysis U-Pb isotopic trace element composition was carried out using a NexION 300S mass spectrometer with an NWR 213 attachment. An system...
The comparative analysis of the structural, morphological, and local electrical properties CVD graphene films synthesized at atmospheric low pressure growth conditions was carried out. use techniques scanning probe microscopy, such as Kelvin force capacitance electrostatic conductive atomic-force microscopy for investigation heterogeneous coverage discussed. A significant change in surface potential values observed indicating formation p-type multilayered domains on single layer n-type CVD....
The results of polarization-dependent Raman spectroscopy single-crystalline LiVO$_2$ exhibiting transition to a diamagnetic state below $T_c \sim $500K are reported. Our measurements clearly detect additional peaks in the low-temperature phase, which disappear nearly completely when heated above $T_c$. Proposed $\sqrt{3}$a \times lattice reconstruction explains these new by Brillouin zone folding. experiment, on one hand, confirms that symmetry non-magnetic phase is not lower than trigonal,...
The crystal structure, thermal behavior, and vibrational spectra of the anthropogenic analogue boussingaultite, (NH4)2Mg(SO4)2·6H2O, its dehydrated counterpart efremovite, (NH4)2Mg2(SO4)3, were studied in detail. sample from Chelyabinsk burning coal dumps has composition (NH4)1.92(Mg1.02Mn0.01Fe0.01)∑1.04(SO4)2·6H2O crystallizes space group P21/a, with a = 9.3183(4), b 12.6070(4), c 6.2054(3) Å, β 107.115(5)°, V 696.70(5) Å3 (at 20 °C), Z 2. evolution steps are as follows: boussingaultite...
The article presents a summary and review of the studies carried out at “Geoanalitik” shared research facilities IGG UB RAS for period 2019–2024 years on development implementation an integrated approach to study chemical isotopic composition, structure properties minerals with high spatial resolution (or performed micro-samples substance) based various techniques in field electron probe microanalysis microscopy, solid-state spectroscopy, X-ray fluorescence, mass spectrometry atomic...
The article presents a generalization and review of the studies carried out at “Geoanalitik” shared research facilities IGG UB RAS for period 2019–2024 years in field spectroscopy minerals synthetic materials with mineral structure – zircon, apatite, spinel, scheelite, lamprophyllite, frankamenite, gypsum, cubanite garnet. Results. (1) X-ray photoelectron was used to study radiationinduced short-range order destruction metamictised zircons; (3) low-temperature boson peak Raman stresses...