A5101794782- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Crystallization and Solubility Studies
- Ferroelectric and Piezoelectric Materials
- X-ray Diffraction in Crystallography
- Solid-state spectroscopy and crystallography
- Crystal Structures and Properties
- Microwave Dielectric Ceramics Synthesis
- Nuclear materials and radiation effects
- Electronic and Structural Properties of Oxides
- Liquid Crystal Research Advancements
- Organic and Molecular Conductors Research
- Photorefractive and Nonlinear Optics
- High-pressure geophysics and materials
- Magnetism in coordination complexes
- Magnetic Properties and Synthesis of Ferrites
- Glass properties and applications
- Photochromic and Fluorescence Chemistry
- Photopolymerization techniques and applications
- Nuclear Physics and Applications
- Luminescence Properties of Advanced Materials
- Perovskite Materials and Applications
- Acoustic Wave Resonator Technologies
- Catalysis and Oxidation Reactions
Lomonosov Moscow State University
1995-2025
Uppsala University
2015-2024
Michelin (France)
2024
Semenov Institute of Chemical Physics
2020-2023
Moscow State University
2023
National Research University Higher School of Economics
2021
Karpov Institute of Physical Chemistry
2010-2020
Petersburg Nuclear Physics Institute
2015-2016
Kurchatov Institute
2015-2016
Physico-Technical Institute
2013
Recent experimental and theoretical reports on the structure of lead zirconate titanate $[\mathrm{Pb}({\mathrm{Zr}}_{x}{\mathrm{Ti}}_{1\ensuremath{-}x}){\mathrm{O}}_{3}$ (PZT)] ceramics with compositions in vicinity morphotropic phase boundary are discussed. There has been ambiguity concerning low-temperature $x=0.52$ samples, due to superlattice reflections which were not explained by reported monoclinic $\mathrm{Cm}$ [B. Noheda, D. E. Cox, G. Shirane, R. Guo, B. Jones, L. Cross, Phys. Rev....
The complex perovskite lead iron niobate, Pb(Fe1/2 Nb1/2 )O3(PFN), has been studied by neutron powder diffraction. Following collection of diffraction data at 300 K and 10 K, structural refinements have carried out means the Rietveld method. As expected, a straightforward unit cell symmetry R 3mwas obtained for structure, with same similar also low temperature. Furthermore, in order to obtain good agreement experiment it was necessary assign non-zero magnetic moments ions, these being...
Dirutile-type CoTeO 4 exhibits a bandgap of ∼2.42 eV as determined by optical absorption spectroscopy.
The magnetic and electrical properties of Co$_3$TeO$_6$ single-crystals with corundum related structure reveal a magnetic-field induced polarization below 21 K. A sharp peak in the specific heat at \approx 18 K indicates reconstructive-type first-order phase transition. From second-harmonic generation (SHG) measurements breaking inversion symmetry is evident point-group was determined as m. temperature dependence polarizations are discussed light SHG results.
The complex metal oxides Ni2InSbO6 (NISO) and Ni2ScSbO6 (NSSO) have been prepared in form of polycrystalline powders by a solid state reaction route. crystal structure magnetic properties the compounds were investigated using combination X-ray neutron powder diffraction, electron microscopy, calorimetric measurements. adopt trigonal structure, space group R3, corundum related Ni3TeO6 (NTO) type. Only one octahedral Ni positions (Ni(2)) NTO was found to be occupied In (Sc). has...
Double perovskites represent a class of materials with promising fundamental properties and broad spectrum potential applications. However, the wide bandgap energy in double presents hindrance to further enhancement their photovoltaic efficiency. In present study, high-pressure technique is employed tune perovskite Co3TeO6 (CTO). A giant reduction ∼37% from 2.93 1.85 eV has been observed after treatment. Subsequent synchrotron-based X-ray diffraction Raman spectroscopy results reveal that...
The luminescent and reflectivity spectra of a series the molybdates with scheelite crystal structure were investigated using synchrotron radiation. main features in energy range 3.2–40 eV analyzed. luminescence measured under X-ray excitation their relative intensities explained frames configuration curves model. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
The approach of deriving new photooptically active polymeric substances by hydrogen bonding between functionalized liquid crystalline (LC) copolymers and low-molecular-mass dopants, containing photochromic azobenzene fragments, is described. formation intermolecular bonds carboxylic groups LC the pyridine fragment dopant leads to stable, nonseparating mixtures in a broad interval contents (up 30 mol % molecules). phase behavior structure are investigated. Induction nematic mesophase observed...
Due of its polymorphism, Mn$_2$FeSbO$_6$ can be synthesized at high pressures and temperatures as a ferrimagnetic ilmenite or an antiferromagnetic perovskite. The structural phase transformation is discussed in detail, magnetic structures are proposed for both phases. high-pressure polymorph rare example $A_2 B'B"$O$_6$ perovskite with solely Mn cations on the $A$-site. Fe Sb ordered $B$-sites. Theoretical calculations suggest complex structure, holding electronic polarization.
Sample preparation, evolution of the crystal structure with Nd content at room temperature, as well dielectric and magnetic properties polycrystalline Bi4 − xNdxTi3O12 solid solutions (x = 0.0, 0.5, 1.0, 1.5, 2.0) are reported. These were structurally characterized by X-ray powder diffraction using Rietveld refinements. For x ≤ samples crystallize in an orthorhombic symmetry. The structural data could be refined polar space group B2cb. orthorhombicity decreases increasing Nd3+ concentration,...
Single crystals of the multiferroic double-perovskite Pb2MnWO6 have been synthesized and their structural, thermal, magnetic dielectric properties studied in detail. Pure perovskite-phase formation stoichiometric chemical composition as-grown are confirmed by X-ray single-crystal powder diffraction techniques as well energy-dispersive inductively coupled plasma mass spectrometry. Detailed structural analyses reveal that experience a phase transition from cubic space group (s.g.) Fm3̅m to an...
The structural and magnetic properties of the Dy2CoMnO6, Dy2NiMnO6 Gd2CoMnO6 double perovskites are investigated using X-ray powder diffraction squid magnetometry. materials adopt an orthorhombic structure (space ground Pnma) with disordered Co(Ni)/Mn cations, exhibit ferrimagnetic transitions near TC ~ 85, 95, 115 K respectively. was found to monotonously depend on distortion (a − c)/(a + c) compounds. crystal compounds as a function temperature (16–1100 range), evidencing changes in BO6...
By slow cooling of the melt, large Bi2Ti2O7 single crystals with a composition close to stoichiometric were grown. No traces impurity phases found on X-ray diffraction patterns. A structural model space group Fd3m and displacive disorder in Bi-sublattice was proposed based crystal data. The dielectric properties as function temperature at different frequencies studied for first time. As case ceramic samples, step-like frequency-dependent anomaly detected about 220 K frequency 1 kHz. It that...
Abstract Sol–gel synthesis was used in order to obtain nanocrystallites of the SrFe 12 O 19 (SFO) hexaferrite an efficient and reliable way. By optimizing initial synthetic conditions, we were able control size nanoparticles (NPs), at lower annealing temperature. The x-ray powder diffraction, transmission electron microscopy (TEM), magnetic measurements have demonstrated a significant relation between morphology, size, properties nanoscale SFO, revealing definite dependence on crystallite...
The magnetic properties of SrFe12O19 (SFO) hard hexaferrites are governed by the complex relation to its microstructure, determining their relevance for permanent magnets´ applications. A set SFO nanoparticles obtained sol-gel self-combustion synthesis was selected an in-depth structural X-Rays powder diffraction (XRPD) characterization means G(L) line-profile analysis. crystallites´ size distribution reveal a clear dependence along [001] direction on approach, resulting in formation...
A detailed neutron powder diffraction study of the atomic structure α-Bi 2 O 3 at high temperatures using Rietveld method was performed to clarify nature unusual magnetic behavior and origin temperature dielectric anomalies in interval 300–700 K. Analysis obtained experimental data shows that there are no evidence a structural phase transition between 295 660 The observed evidently governed by changes electron subsystem bismuth oxide.