On May 6, 2017 Eduard P. Volchkov, the prominent scientist worked in the area of thermophysics, Doctor of Technical Sciences, Professor, and Full Member of the Russian Academy of Sciences would have celebrated his 80th anniversary.
Eduard P. Volchkov died on February 8, 2013.
Time passed since then allowed for a more clear evaluation of his significant
contribution in the development of thermophysics in our country. We remember
and honor the prominent scientist and the remarkable person.
June 7, 2017 is the 80th
anniversary of a prominent researcher in the field of materials science, Doctor
of Technical Sciences, Professor Galina M. Zharkova.
Yu. Yu. Bozhko, O. S. Subbotin, K. V. Gets, R. K. Zhdanov, V. R. Belosludov
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: решеточная динамика, термодинамические свойства, фазовые равновесия, двойные клатратные гидраты, закись азота, ксенон, lattice dynamics, thermodynamic properties, phase equilibria, double clathrate hydrates, nitrous oxide, xenon
Structural, dynamic, and thermodynamic features of double hydrates of xenon and nitrous oxide are calculated. Thermodynamic stability regions of these hydrates are found. At the atmospheric pressure the xenon hydrate is in the equilibrium with the gas phase at temperatures up to 263 K, whereas at these pressures the nitrous oxide hydrate decomposes already at 218 K. A strong dependence of the equilibrium temperatures and pressures of the formation/decomposition of double nitrous oxide and xenon hydrates on the composition of their mixture in the gas phase is shown.
M. R. Ryzhikov1,2, S. G. Kozlova1,2 1Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 2Novosibirsk National Research State University, Novosibirsk, Russia
Keywords: кластерные трехъядерные соединения железа, индуцируемые токи, химические сдвиги ЯМР Н, теория функционала плотности, trinuclear iron cluster compounds, induced currents, Н NMR chemical shifts
, density functional theory
The quantum chemical calculations of induced electric currents in (μ-H)2Fe3(μ3-Q)(CO)9 complexes, where Q = S, Se, Te, are carried out. It is demonstrated that the appearance of anomalous 1Н NMR chemical shifts on bridging hydrogen atoms is, first of all, due to the effect of induced currents on iron atoms.
Yu. V. Fedoseeva1,2, T. A. Duda3, A. G. Kurenya1, A. V. Gusel'nikov1, K. S. Zhuravlev3, O. Yu. Vilkov4, L. G. Bulusheva1,2, A. V. Okotrub1,2 1Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 2Novosibirsk National State Research University, Novosibirsk, Russia 3Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 4St. Petersburg State University, Sankt-Peterburg, Russia
Keywords: наночастицы CdS, углеродные нанотрубки, рентгеновская фотоэлектронная спектроскопия, рентгеновская спектроскопия поглощения, электронное строение, CdS nanoparticles, carbon nanotubes, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, electronic structure
The composition and electronic structure of cadmium sulfide (CdS) nanoparticles formed by the Langmuir-Blodgett (LB) technique on clean silicon wafers and the surface of vertically aligned carbon nanotube (CNT) arrays are studied by X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The samples were annealed in a vacuum at 175 °C and 225 °C to remove the organic matrix of the LB film. From the analysis of the XPS data the increased concentration of sulfate groups on the surface of CdS nanoparticles formed on CNTs and the electron density transfer from CdS to CNTs are determined. An increase in the LB film annealing temperature causes an increase in the degree of crystallinity and the CdS crystallite size and a decrease in the photoluminescence intensity of a CdS-CNT hybrid.
A. A. Ryadun, V. A. Nadolinny, O. V. Antonova, M. I. Rakhmanova
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: люминесценция, ЭПР спектроскопия, кристаллы трибората лития, катионные вакансии, luminescence, EPR spectroscopy, lithium triborate crystals, cation vacancies
An attempt is made to explain the causes of coloration of LiB3O5 crystals after their long-term operation as laser elements. By EPR and optical spectroscopy the impurity and radiation centers are studied in as-grown LiB3O5 crystals and in the crystals whose color appeared after the long-term operation as laser elements. In a number of as-grown crystals a copper impurity is detected. EPR spectral parameters and the structural positions of Cu2+ ions are found. Defect formation features in electron irradiated as-grown LiB3O5 crystals and in the most colored regions of crystals of spent laser elements are analyzed. It is shown that in both growth crystals and crystals after long-term operation as laser elements the same set of radiation defects is observed: oxygen О- in the interstitial position, an О- hole center in the crystal structure, and the В2+ electron center due to the removal of an oxygen atom near the lithium vacancy. The only distinction is that the concentration of these radiation defects in crystals long used as laser elements is higher than that in growth ones by an order of magnitude. The results obtained enable the conclusion that the cause of coloration of LiB3O5 crystals is photo-induced diffusion of lithium atoms and their capture by cation vacancies in the dark part of the crystal, which provides the formation and accumulation of lithium vacancies in the region where the laser beam passes.
A. I. Romanenko1,2, G. E. Yakovleva1, V. E. Fedorov1,3, A. Yu. Ledneva1, V. A. Kuznetsov1, A. V. Sotnikov1, A. R. Tsygankova1,3, B. M. Kuchumov1 1Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 2Tomsk National Research State University, Tomsk, Russia 3Novosibirsk National Research State University, Novosibirsk, Russia
Keywords: слоистые халькогениды переходных металлов, электропроводность, термоэдс, layered transition metal chalcogenides, electrical conductivity, Seebeck coefficient
Temperature dependences of the electrical conductivity are studied in the range 4.2-300 K and Seebeck coefficient at room temperature of bulk samples of tungsten dichalcogenide polycrystals with niobium substitutions for tungsten and selenium substitutions for sulfur - W1- x Nb x (S1- y Se y )2. The two-dimensionalization of electron transport properties is detected at niobium concentrations x ³ 0.1 in W1- x Nb x S2 and x ³ 0.05 in W1- x Nb x Se2. In samples with additional partial selenium substitution for sulfur the electron transport remains three-dimensional. At room temperature the Seebeck coefficient (at equal electrical conductivities) is several times higher in the samples with quasi-two- dimensional transport than in the samples with three-dimensional transport. The calculation of the power factor at room temperature shows its nine times increase.
Yu. A. Galkina1,2, N. A. Kryuchkova1, M. A. Vershinin1, B. A. Kolesov1,2 1Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 2Novosibirsk National Research State University, Novosibirsk, Russia
Keywords: спектры КР, сильные водородные связи, квантово-химический расчет, изотопозамещение, Raman spectra, strong hydrogen bonds, quantum chemical calculation, isotopic substitution
The work deals with the establishment of the dependence of the vibrational frequencies of strong O-H…O and N-H…O hydrogen bonds for the diagnosing the bonds themselves. To this end, the Raman spectra of a large number of different normal and deutero-substituted crystals characterized by the presence of strong O-H…O and N-H…O bonds are measured and the quantum chemical calculation is performed for one of these compounds. The dependence of the O-H stretching frequency on the O…O distance is constructed differing from that previously known for short O…O contacts. The mechanisms of significant broadening of the O-H vibration band in strong O-H…O hydrogen bonds are considered. Different dependences of the N-H vibrational frequencies in N-H…O bonds are reported and the causes of this diversity are discussed.
O. G. Shakirova1, L. G. Lavrenova2,3, N. V. Kuratieva2,3, A. S. Bogomyakov3,4, L. A. Sheludyakova2,3, A. P. Mosalkova5, Yu. V. Grigoriev5 1Komsomolsk-on-Amur State Technical University, Komsomolsk-on-Amur, Russia 2Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 3Novosibirsk National Research State University, Novosibirsk, Russia 4International Tomography Center, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 5Belarusian State University, Minsk, Belarus
Keywords: синтез, координационные соединения, железо(II), 2-(2-трет-бутилтетразол-5-ил)пиридин, структура, магнитные свойства, synthesis, coordination compounds, iron(II), 2-(2-tert-butyltetrazol-5-yl)pyridine, structure, magnetic properties
Iron(II) dicyanamide and isothiocyanate compounds with 2-(2- tert -butyltetrazol-5-yl)pyridine (L) of the composition [FeL2(C2N3)2]×2H2O (I) and [FeL2(NCS)2]H2O (II) are synthesized and studied. The compounds are examined using powder and single crystal XRD (for I), electron (diffuse reflectance spectra) and IR spectroscopy, static magnetic susceptibility. The analysis of the dependence meff( Т ) indicates that the exchange interactions of antiferromagnetic nature appear between the iron(II) ions at temperatures below 50 K.
