A5015740622- Solid-state spectroscopy and crystallography
- Crystal Structures and Properties
- Optical and Acousto-Optic Technologies
- Photorefractive and Nonlinear Optics
- Transition Metal Oxide Nanomaterials
- Thermography and Photoacoustic Techniques
- Catalysis and Oxidation Reactions
- High-pressure geophysics and materials
- Solid State Laser Technologies
- TiO2 Photocatalysis and Solar Cells
- Gas Sensing Nanomaterials and Sensors
- Spectroscopy and Laser Applications
- X-ray Diffraction in Crystallography
- Catalytic Processes in Materials Science
- Advanced Semiconductor Detectors and Materials
- Advanced Photocatalysis Techniques
- Pigment Synthesis and Properties
- Nanomaterials for catalytic reactions
- Silicone and Siloxane Chemistry
- Wireless Sensor Networks for Data Analysis
- Magnetic and Electromagnetic Effects
- Plant and Biological Electrophysiology Studies
- Smart Grid Energy Management
- Polyoxometalates: Synthesis and Applications
- Material Science and Thermodynamics
Belarusian State University
2016-2024
National Academy of Sciences of Belarus
2019
Oles Honchar Dnipro National University
1993-2018
University of Latvia
1980
Georgi Nadjakov Institute of Solid State Physics
1980
Azerbaijan National Academy of Sciences
1979
Abstract Single crystals Bi2TeO5 samples have been used for measurements of the dielectric constant, loss and electrical conductivity over a wide range temperature (20−400°C), frequencies (2.102−5.107 Hz) fields (103−107 V/m). For three crystallographic directions constants at room are εa = 62, εb 70, εc 36 gradually increase with in temperature. There relaxation maxima tan δ σ∼ dependence. Voltage-current curves obey to laws space charge limited currents. The low values carrier mobility μef...
Data from measurements of current-voltage characteristics, dark conductivity and optical transmission on samples undoped B-doped, Czochralski-grown Bi2TeO5 single crystals are reported. The experimental results show that in observed temperature field ranges the charge transport processes these conditioned by localized states associated with impurity atoms. Keywords: Bismuth telluritecurrent-voltage characteristiccurrent injectionhopping
Abstract The Bi2TeO5 polar phase (sp.gr.Abm2) is found to be changed centrosymmetric orthorombic one in the result of a first-order transition. This fully reversible transition spread over interval 780–820°C. Very strong dielectric relaxation at preceding temperatures related with oxygen vacancies redistribution crystal lattice. Upper temperature distinctive by its pronounced electric conductivity supposedly anionic nature.
The optica1 properties and the domain structure of ferroelastic crystals MTe2O5 (M = Ca, Sr, Cd) type were investigated. Three groups domains two types walls (W W') observed. analysis observed permissible boundaries in these allow to reveal six orientation states. transition 6/mmm - 2/m is predicted on basis data obtained. correlation lattice constants gives an idea possible connection between hypothetical prototype hexagonal monoclinic one.
Study of electrophysiological indicators the condition and behavior plants has become more important in development farming activities search for effective ways to improve productivity crops. The influence external light on adaptive ability corn leaf cells rhythmic cold stimulation was determined experimentally. method is not adequate studied plants, but its application allows us evaluate stability plant stimuli. consists repeating irritation during time period less duration than relative...
The photoconductivity in the wide intervals of temperatures and wavelengths were studied photorefractive Bi2TeO5 single crystals. It is supposed that optical memory crystals may be connected with deep local levels participating electron processes photoconductivity.
The current-voltage characteristics (I-V ) of non-stoichiometric bismuth tellurite crystals were studied in a range temperatures from 150 • C to 350 and fields up 2.5 kV/cm with asymmetric contacts (In-Ga eutectic Na2SiO3).The I-V curves observed monopolar injection are described by the approximation space charge limited currents.In composition 47% Bi2O3-53% TeO2 electronic conduction is prevailed.In 43% Bi2O3-57% conductivity contributed electrons holes.The spectrum local states band gap...
Министерство науки и высшего образования Российской Федерации Федеральное государственное бюджетное образовательное учреждение «Тверской государственный университет» ФИЗИКО-ХИМИЧЕСКИЕ АСПЕКТЫ ИЗУЧЕНИЯ КЛАСТЕРОВ, НАНОСТРУКТУР И НАНОМАТЕРИАЛОВ МЕЖВУЗОВСКИЙ СБОРНИК НАУЧНЫХ ТРУДОВ
The results of the real twinning investigations in pure ferroelastic calcium and cadmium dietllurites are given. study experimental domain structure confirms predicted 6/mmF2/m phase transition. crystallographic method for calculations adjacent rotation angles is considered. vectors [image omitted] 15 possible combinations two domains CdTe2O5 Notes This work was presented at Ill-d national seminary on physics ferroelastics (Kharkov,USSR, May 1985).
Spectral dependences of optical absorption coefficient the bismuth tellurite single crystals grown by Chohralsky method have been observed. The investigations were carried out on fresh-prepared samples different thickness after annealing up to 400 degrees Celsius in air and vacuum also illumination intensive light with various wavelengths. value forbidden band for indirect transition (E<SUB>gi</SUB>) is approximately 3.11 eV at room temperature it decreases about 10<SUP>-3</SUP>eV multiplied...