A5038208510- Crystal Structures and Properties
- Laser Design and Applications
- Solid-state spectroscopy and crystallography
- Inorganic Fluorides and Related Compounds
- Advanced Condensed Matter Physics
- Inorganic Chemistry and Materials
- X-ray Diffraction in Crystallography
- Spectroscopy and Laser Applications
- Luminescence Properties of Advanced Materials
- Crystallization and Solubility Studies
- Solid State Laser Technologies
- Iron-based superconductors research
- Laser-Matter Interactions and Applications
- Catalysis and Oxidation Reactions
- Magnetic and transport properties of perovskites and related materials
- Atomic and Subatomic Physics Research
- Microwave Dielectric Ceramics Synthesis
- High-pressure geophysics and materials
- Glass properties and applications
- Nuclear materials and radiation effects
- Magnetism in coordination complexes
- Nonlinear Optical Materials Research
- Atomic and Molecular Physics
- Crystallography and Radiation Phenomena
- Ferroelectric and Piezoelectric Materials
Lomonosov Moscow State University
2016-2025
Moscow State University
1990-2023
Institute for Physics and Power Engineering
2019-2020
Novosibirsk State University
2018
Hebrew University of Jerusalem
2012
TU Wien
2011
Tomsk Polytechnic University
1990-2007
Admiral Nevelskoy Maritime State University
2005
All-Russian Electrotechnical Institute named after V.I.Lenin
2005
TU Dresden
2001-2004
We report the preparation and crystal structure of potassium hafnium pentafluoride, KHfF 5 , obtained by hydrothermal technique. The compound crystallizes in orthorhombic noncentrosymmetric space group P 2 1 with unit-cell parameters a = 6.2843 (3), b 7.8063 (3) c 15.8286 (7) Å. Hf atoms are coordinated eight F atoms, forming square antiprismatic polyhedra. Bonding pairs, HfF 8 antiprisms interconnected via common F-atom edges form double chain A comparison other complex fluorides alkali...
We report a detailed study of the magnetic properties buckled kagome compound ${\mathrm{Cu}}_{3}{\mathrm{Y}(\mathrm{SeO}}_{3}{)}_{2}{\mathrm{O}}_{2}\mathrm{Cl}$ using heat capacity, magnetization, powder neutron diffraction, electron spin resonance, and first-principles calculations. The crystal structure is confirmed to be isotypic with mineral francisite, orthorhombic space group symmetry Pmmn throughout temperature range 5--300 K. Magnetization, diffraction confirm long order below...
Novel Cu2+-based compounds PbCu2(SeO3)2Cl2 (space group C2/c; a = 13.056(1) Å; b 9.5567(9) c 6.9006(6) β 90.529(7)°; RI 0.0371) and PbCu2(TeO3)2Cl2 P21; 7.2401(2) 7.2688(2) 8.2846(2) 96.416(2)°; 0.0570) have been obtained by solid-state synthesis. Their crystal structures are remarkably dissimilar underlie very different magnetic behavior. While can be well described spin-chain model with an exchange coupling of J1 ≃ 160 K, is spin-dimer system that, however, features comparable...
In this combined experimental and theoretical paper, we study the properties of ${\mathrm{Cu}}_{3}\mathrm{Sm}{({\mathrm{SeO}}_{3})}_{2}{\mathrm{O}}_{2}\mathrm{Cl}$ belonging to francisite family compounds, which are novel frustrated layered compounds. is synthesized through a solid state reaction. Characterizations measurements magnetization, specific heat, X-band electron spin resonance, rare-earth optical spectroscopy, establish that compound orders antiferromagnetically at...
The problem of searching for low-dimensional magnetic systems has been a topical subject and attracted attention the chemistry physics community last decade. In systems, ions are distributed anisotopically form different groups such as dimers, chains, ladders, or planes. 3D frameworks, distances between equal in all directions while within from those groups. main approach desired is priori crystal chemical design expecting needed distribution transition metal resulting structure. One...
The crystal structure and physical properties of Bi3Pb2Nb2O11Cl, a member the Sillen−Aurivillius phase intergrowth family, have been probed using powder neutron diffraction, high-resolution transmission electron microscopy (HRTEM), second harmonic generation (SHG) tests, alternating current impedance methods. It is shown that this compound undergoes diffuse ferroelectric type transition at Tc ∼ 683 K. Although diffraction data show has pseudo-tetragonal symmetry (parent space group P4/mmm,...
The layered intergrowth phases Bi4MO8Cl (M = Nb, Ta), structurally related to the well-known Aurivillius phase ferroelectrics, have been studied using SHG and a.c. impedance techniques. Both undergo a polar centrosymmetric ferroelectric-type transition (Tc 765 640 K for M Nb Ta, respectively). crystal structure of low temperature Bi4NbO8Cl has re-analysed, tentative Bi4TaO8Cl determined, from powder neutron diffraction data. basic structural features are confirmed, but significant details...
The heat capacity of helical magnets Cu2OSeO3 and MnSi has been investigated at high pressures by the ac-calorimetric technique. Despite differing nature their magnetic moments, demonstrate a surprising similarity in behavior thermodynamic properties phase transition. Two characteristic features transitions both substances (peak shoulder) behave also similar way if analyzed as function temperature. This probably implies that longitudinal spin fluctuations typical weak itinerant like...
We report the synthesis and characterization of new bismuth iron selenite oxochloride Bi2Fe(SeO3)2OCl3. The main feature its crystal structure is presence a reasonably isolated set spin S = 5/2 zigzag chains corner-sharing FeO6 octahedra decorated with BiO4Cl3, BiO3Cl3, SeO3 groups. When temperature lowered, magnetization passes through broad maximum at Tmax ≈ 130 K, which indicates formation magnetic short-range correlation regime. same behavior demonstrated by integral electron resonance...
New noncentrosymmetric cerium( iv ) iodate fluoride Rb 2 Ce(IO 3 5 F was prepared employing a hydrothermal technique.
We present the synthesis and experimental theoretical study of new member francisite family, $\mathrm{C}{\mathrm{u}}_{3}\mathrm{Yb}{(\mathrm{Se}{\mathrm{O}}_{3})}_{2}{\mathrm{O}}_{2}\mathrm{Cl}$. The compound reaches an antiferromagnetic order at ${T}_{\mathrm{N}}=36.7\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ experiences first-order spin-reorientation transition to weakly ferromagnetic phase ${T}_{\mathrm{R}}=8.7\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ evidenced in specific heat...
We performed Raman studies and a dielectric characterization of the pseudo-kagome Cu3Bi(SeO3)2O2X (X = Cl, Br). These compounds share competing nearest-neighbour ferromagnetic exchange frustrating next-nearest-neighbour antiferromagnetic as well highly noncollinear magnetic ground state. However, at low temperature they differ with respect to existence inversion symmetry. For both there exists pronounced interplay polar phonon modes quantum fluctuations. A novel mode appears for temperatures...
Cs7Nd11(SeO3)12Cl16, the complex selenite chloride of cesium and neodymium, was synthesized in NdOCl-SeO2-CsCl system. The compound has been characterized using single-crystal X-ray diffraction, electron transmission microscopy, luminescence spectroscopy, second-harmonic-generation techniques. Cs7Nd11(SeO3)12Cl16 crystallizes an orthorhombic unit cell with a = 15.911(1) Å, b 15.951(1) c 25.860(1) Å noncentrosymmetric space group Pna2(1) (No. 33). crystal structure can be represented as...
Synthesis, thermodynamic properties, and microscopic magnetic model of ilinskite-type KCu$_{5}$O$_2$(SeO$_3$)$_2$Cl$_3$ built by corner-sharing Cu$_4$ tetrahedra are reported, relevant magnetostructural correlations discussed. Quasi-one-dimensional behavior with the short-range order around 50\,K absence long-range down to at least 2\,K is observed experimentally explained in terms weakly coupled spin ladders (tubes) a complex topology formed upon fragmentation tetrahedral network. This...