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1.
Dmitry A. Zyuzin Svetlana V. Cherepanova Elena B. Burgina Victor G. Kostrovskii 《Journal of solid state chemistry》2006,179(10):2965-2971
Genesis of the structure of zirconia particles prepared by precipitation of amorphous hydrated zirconia by ammonia from the ZrO(NO3)2 solution followed by a mild hydrothermal treatment (HTT) of precipitate, washing and calcination under air up to 1000 °C has been studied by X-ray diffraction (XRD), Raman and FTIRS. As revealed by FTIRS of lattice modes, the local structure of amorphous zirconia subjected to HTT is close to that in m-ZrO2. This helps to obtain nearly single-phase monoclinic nanozirconia (particle size 5-15 nm) already after a mild calcination at 500 °C. Stability of this phase with nanoparticles sizes below the critical value determined by thermodynamic constraints is due to its excessive hydroxylation demonstrated by FTIRS. Dehydroxilation and sintering of these nanoparticles at higher (600-650 °C) temperatures of calcination leads to reappearance of the (111) “cubic” reflection in XRD patterns. Modeling of XRD patterns revealed that this phenomenon could be explained by polysynthetic (001) twinning earlier observed by HRTEM. 相似文献
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I. N. Zyuzin 《Russian Journal of Organic Chemistry》2013,49(5):678-685
Reaction of bis(methoxy- and ethoxy-NNO-azoxy)methane with benzyl halides and alkali under the conditions of a phase-transfer catalysis furnishes in one stage E-1-(alkoxy-NNO-azoxy)-2-arylethene in 21–55% yields. The intermediate products, 1,1-bis(alkoxy-NNO-azoxy)-2-arylethanes under the action of alkali eliminate one of the two alkoxy-NNO-azoxy groups with the formation of a double bond. The optimum solvent is DMSO, and as benzyl halides, benzyl chlorides. In the case of 4-bromobenzyl bromide a formation was found of a side bisbenzylation product, 1,3-bis(4-bromophenyl)-2,2-bis(methoxy-NNO-azoxy)propane. 相似文献
4.
Zyuzin I. N. Golovina N. I. Fedorov B. S. Shilov G. V. Nechiporenko G. N. 《Russian Chemical Bulletin》2003,52(3):761-763
Alkylation of potassium salt of methylnitrosohydroxylamine with 1,7-dichloro-2,4,6-triaza-2,4,6-trinitroheptane afforded 2,3,6,8,10,13,14-heptaaza-6,8,10-trinitro-4,12-dioxapentadeca-2,13-diene 2,14-dioxide. The structure of the reaction product was established by X-ray diffraction analysis. 相似文献
5.
A. M. Zyuzin M. A. Bakulin V. V. Radaikin N. V. Yantsen 《Physics of the Solid State》2017,59(2):268-273
Zero spin-wave mode in inhomogeneous magnetic films with orthorhombic anisotropy has been found to exhibit a change of its localization region in two of three typical angular dependences of resonance fields of high-intensity modes. It has been shown that the anisotropy fields on both sides of the film can be determined from the resonance fields of the zero and uppermost high-intensity spin-wave modes of spin-wave resonance spectra. 相似文献
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V. P. Kolko E. M. Moroz V. V. Kriventsov D. A. Zyuzin 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(5):695-698
Cerium dioxide samples of different dispersivity, obtained by different methods, have been investigated by X-ray diffraction (XRD) analysis, full-profile analysis of diffraction patterns, calculation of radial distribution function (RDF) of electron density, and extended X-ray absorption fine-structure (EXAFS) spectroscopy. According to the XRD data, the samples studied can be identified in the fluorite structure with conventional unit-cell parameters. However, the local structure of highly dispersed samples, determined by the RDF and EXAFS methods, changes: the coordination spheres for the Ce-O distances are represented by two distances. 相似文献
9.
A. M. Zyuzin M. A. Bakulin V. V. Radaikin S. N. Sabaev N. V. Yantsen 《Bulletin of the Russian Academy of Sciences: Physics》2010,74(10):1431-1433
It is shown that effective spin pinning in a multilayer can be provided by both the layer that is in the state of reactive
(elastic) medium and (at a sufficiently large difference in the uniform-resonance fields) by the layer serving a dispersive
medium for spin waves. 相似文献
10.
A. S. Ivanova E. V. Kul’ko O. V. Klimov G. A. Bukhtiyarova G. S. Litvak A. A. Budneva E. A. Paukshtis D. A. Zyuzin E. M. Moroz V. I. Zaikovskii A. S. Noskov 《Kinetics and Catalysis》2008,49(6):791-801
The influence of the texture of γ-Al2O3 on the formation of Co(Ni)-Mo catalysts for hydrodesulfurization of the diesel fraction is studied. As shown by low-temperature N2 adsorption, X-ray diffraction, IR spectroscopy of adsorbed molecules, and high resolution electron microscopy (HREM), use of a support with a larger specific surface and a lower total concentration of terminal OH groups makes it possible to prepare more active catalysts. The electron density radial distribution method shows that the finely dispersed cobaltcontaining catalyst in its initial state contains CoMoO4, Al2(MoO4)3, and CoAl2O4, the last two phases being present in trace amounts. After the reaction, this catalyst contains cobalt-doped molybdenum sulfide. According to HREM data, the active phase of the cobalt-containing catalyst consists of layered sulfide association species Co1.3Mo2S3.3, which differ in composition from the bulk phase CoMo2S4. It is assumed that, out of the 1.3 cobalt atoms in Co1.3Mo2S3.3 0.3 Co occurs at the edges of the association species and 1.0 Co is intercalated into their interlayer space, and 0.7 S at the boundary between the association species and the Al2O3 phase is replaced by the corresponding amount of oxygen. 相似文献