A5063656630- Ferroelectric and Piezoelectric Materials
- Solid-state spectroscopy and crystallography
- Glass properties and applications
- Microwave Dielectric Ceramics Synthesis
- Multiferroics and related materials
- Optical and Acousto-Optic Technologies
- Acoustic Wave Resonator Technologies
- Dielectric materials and actuators
- Semiconductor materials and devices
- Photorefractive and Nonlinear Optics
- Material Dynamics and Properties
- Luminescence Properties of Advanced Materials
- Transition Metal Oxide Nanomaterials
- Advanced ceramic materials synthesis
- Inorganic Fluorides and Related Compounds
- Dielectric properties of ceramics
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Silicon Nanostructures and Photoluminescence
- Surface Roughness and Optical Measurements
- Pigment Synthesis and Properties
- Molten salt chemistry and electrochemical processes
- Material Science and Thermodynamics
- Mineralogy and Gemology Studies
- Semiconductor materials and interfaces
Ioffe Institute
2015-2024
Peter the Great St. Petersburg Polytechnic University
2011-2023
Kazan Federal University
2017
Physico-Technical Institute
1992-2016
Russian Academy of Sciences
2007-2015
Physicotechnical Institute
2006
Timiryazev Institute of Plant Physiology
1991
We measured the time dependencies of dielectric permittivity a single crystal lead magnoniobate in zero-field--cooled regime. The logarithmic decay response was observed glassy phase. $\ensuremath{\tau}$ from moment field application for phase transition glasslike to field-induced ferroelectric state take place, at temperatures below 220 K. is accompanied by emerging even harmonics permittivity. It shown that $\mathrm{ln}\ensuremath{\tau}$ depends linearly on both inverse temperature and...
An investigation was carried out on both the linear and nonlinear parts of complex dielectric susceptibility in frequency temperature ranges 10-3-103 Hz 100-450 K, respectively. The analysis imaginary part has revealed existence a broad spectrum relaxation times above range. dependence most probable obtained. For temperatures T
The phase transition from tetragonal to rhombohedral in sodium bismuth titanate (NBT) is studied by means of neutron scattering. It found that the has incommensurate modulation along four-fold axis precursor phase. appearance discussed on symmetry grounds framework phenomenological theory transitions.
Abstract The low frequency measurements of lineer and nonlinear components complex dielectric permittivity (ε) were carried out on leed magnoniobate (PMN) single crystals in the wide temperature region (100–450K). It has been shown that application a DC field (DCF) to PMN crystal produces essential different results depending DCF direction. Some additional peculiarities appear ε(T) dependences when is applied <111> direction at values E⩾Et ∼1.5 kV/cm. Such behavior may be explained terms...
Control of domain and wall configurations in antiferroelectrics is a necessary step towards practical use new functionalities based on polar structures. Here we propose demonstrate engineering scheme that provides an antiferroelectric state with only one type orientational domains walls. We situ synchrotron diffraction experiment material, where the transition from high-symmetry nonpolar phase to occurs via crossing intermediate, once passed under moderate electric field, final can be fully...
Photo-induced current through nanocomposite heterojunction structures consisting of a TiO2 coating activated with embedded gold nanoparticles on top Si, SiO2, and columnar structured SiO2 is studied. The highest photo-activity in the visible part spectrum found composite containing pillar-like silicon dioxide nanostructures. Experimental results were qualitatively explained basis Franz-Keldysh effect taking into account effects electrical inhomogeneities appearing at charged nanoparticles....
Abstract The preliminary dielectric and neutron scattering results obtained on two granular ferroelectrics (with particles diameters ∼ 7 nm) – sodium nitrite Rochelle salt embedded into microporous glass matrix are presented.
Dielectric properties and temperature evolution of the crystal structure nanocomposites on basis porous glasses KNO3 embedded into pores have been studied heating cooling. It is shown that stability ferroelectric phase depends nanoparticle sizes prehistory sample preparation measurement procedure. The interval, where exists, increases decreasing size. In composite with average pore diameters 7 nm, becomes stable down to 100 K after first heating–cooling circle.
Abstract The time dependence of the complex dielectric permittivity lead magnoniobate (PMN) single crystal in an applied external DC field, was studied. field a “zero-field-cooling” regime. All measurements were carried out for low-temperature PMN non-ergodic glassy phase. transition to polar state at τ from moment application observed. on both temperature and obtained
The paper deals with the problem of determining mechanical macroparameters porous material in case knowing information about it's structure. Fabric tensor and porosity was used to describe structure material. Experimental study presented. In research two-component liquid polyurethane plastics cold curing Lasilcast (Lc-12) used. Then samples scanned on computer tomography. Resulting data analyzed. Regular subvolume cut out after analyses. tests performed. As a result we get fabric tensor,...
The low‐frequency dielectric behavior of in situ crystallized and stabilized nanocrystalline t‐ NbO 2 amorphous silicon oxycarbide (SiOC) ceramic nanocomposites derived from niobium‐modified poly(hydridomethylsiloxane) (PHMS) is reported. Commercially available PHMS modified using Nb(OC H 5 ) via chemical mechanical mixing route. It observed that the synthesis route heat‐treatment temperatures significantly affect crystallization phases, where c‐ NbC SiOC are formed through modification...