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Antipenko B. M. Vikhrov M. N. Mak A. A. Pis'mennyi V. A. Polikarpova V. N. Tomashevich Yu. V. 《Journal of Applied Spectroscopy》1978,29(2):921-926
Journal of Applied Spectroscopy - 相似文献
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Initiation of a self-sustained volume discharge in CO2-containing gaseous mixtures kept under a pressure of up to 10 atm with the aim of amplifying picosecond IR pulses is considered.
Experimental electricdischarge and optical characteristics of a wide-aperture high-pressure CO2 amplifier are presented. The feasibility of designing terawatt laser equipment with a master oscillator and preamplifier
is discussed. 相似文献
3.
G. N. Churilov N. S. Nikolaev A. V. Cherepakhin A. I. Dudnik E. V. Tomashevich M. V. Trenikhin N. G. Bulina 《Technical Physics》2018,63(2):216-219
We have reported on the comparative characteristics of thermal oxidation of a carbon condensate prepared by high-frequency arc evaporation of graphite rods and a rod with a hollow center filled with nickel powder. In the latter case, along with different forms of nanodisperse carbon, nickel particles with nickel core–carbon shell structures are formed. It has been found that the processes of the thermal oxidation of carbon condensates with and without nickel differ significantly. Nickel particles with the carbon shell exhibit catalytic properties with respect to the oxidation of nanosized carbon structures. A noticeable difference between the temperatures of the end of the oxidation process for various carbon nanoparticles and nickel particles with the carbon shell has been established. The study is aimed at investigations of the effect of nickel nanoparticles on the dynamics of carbon condensate oxidation upon heating in the argon–oxygen flow. 相似文献
4.
Andreev S. I. Zobov E. A. Sokolov V. G. Tomashevich Yu. V. 《Journal of Applied Spectroscopy》1976,25(1):824-828
Journal of Applied Spectroscopy - 相似文献
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Yu. Mikhlin M. Likhatski Ye. Tomashevich A. Romanchenko S. Erenburg S. Trubina 《Journal of Electron Spectroscopy and Related Phenomena》2010
The S L- and Au L3-edge X-ray absorption fine structure and X-ray photoelectron spectra of nanoscale Au–S products formed via the reduction of aqueous HAuCl4 by sulfide ions and immobilized onto graphite have been acquired. The TEY XANES and XPS spectra implied the formation of predominant polysulfide species and metallic gold, while the transmission spectra showed Au–S bonding, the share of which increased with increasing molar Na2S/HAuCl4 ratio in the reaction solution. The Au–S distances derived from EXAFS analysis changes from 2.31 Å to 2.325 Å with the concentration of sodium sulfide in solution, being longer than that for cuprite-type crystalline Au2S (2.174 Å). It has been concluded from all the evidence that the surface of gold sulfide decomposes in air and in ultra-high vacuum even before X-ray irradiation. 相似文献
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I. V. Osipova N. G. Vnukova G. A. Glushchenko A. S. Krylov E. V. Tomashevich S. M. Zharkov G. N. Churilov 《Physics of the Solid State》2009,51(9):1972-1975
This paper presents the results of an investigation of nickel-containing carbon nanostructures prepared by plasma-chemical
synthesis in a carbon-helium plasma jet at atmospheric pressure with the arc fed by a high-frequency current. It is demonstrated
that, under these conditions, the conversion of graphite into a carbon condensate reaches 98 wt % and the contents of carbon
nanotubes and nickel in this condensate are 72 and 10 wt %, respectively. Sequential treatment with nitric and hydrochloric
acids has made it possible to extract purified carbon nanotubes and nickel nanoparticles coated with a carbon shell (approximately
50 nm thick) in which the nickel content is 4 wt %. Data are presented on the diameters of the prepared nanotubes and on the
state of carbon in the samples. 相似文献
8.
G. N. Churilov I. V. Osipova Ye. V. Tomashevich G. A. Glushchenko A. S. Fedorov Z. I. Popov N. V. Bulina S. N. Vereshchagin A. M. Zhizhaev A. V. Cherepakhin 《Journal of Experimental and Theoretical Physics》2011,113(6):1057-1062
Composite nanoparticles consisting of magnesium, nickel, and carbon atoms are studied both theoretically and experimentally.
The calculations performed in terms of the density functional theory show that the jump frequency of hydrogen atoms in nickel-containing
magnesium hydride increases substantially near impurity nickel atoms; as a result, the rate of hydrogen absorption by magnesium
also increases. Nickel on the magnesium surface is shown to be absorbed via an island growth mechanism. Composite Mg-C, Ni-C,
and Mg-Ni-C powders are produced by plasmachemical synthesis in a carbon-helium plasma stream. Hydrogen is introduced into
a chamber during synthesis. It is found by X-ray photoelectron spectroscopy and thermogravimetric analysis that, among these
three composites, only Mg-Ni-C contains magnesium fixed in the MgH2 compound. The process of such “ultrarapid” hydrogenation of magnesium, which occurs in the time of formation of composite
nanoparticles, can be explained by the catalytic action of nickel, which is enhanced by a high temperature. Scanning electron
microscopy micrographs demonstrate the dynamics of the dehydrogenation of Mg-Ni-C composite nanoparticles in heating by an
electron beam. 相似文献
9.
Yu.?L.?Mikhlin A.?S.?RomanchenkoEmail author E.?V.?Tomashevich M.?N.?Volochaev Yu.?V.?Laptev 《Journal of Structural Chemistry》2017,58(6):1137-1143
Mineral valleriite of the Talnakh deposit, which consists of alternating copper-iron sulfide layers and brucite-like layers of magnesium-aluminium hydroxide is studied for the first time by XPS at photon excitation energies ranging from 1.253 keV to 6 keV and CuL FeL, SL, AlL, MgK, and OK edge TEY XANES using synchrotron radiation. The comparison of the XPS and XANES spectra of valleriite and chalcopyrite, in particular, demonstrates that in the sulfide layers of valleriite, Cu+ and Fe3+ are in a tetrahedral coordination, however, a local positive charge on both cations is slightly lower than that in chalcopyrite, apparently, due to a structure disorder. The concentration of oxygen-bound iron decreases with an increase in the depth of the analyzed layer even after ion etching; probably, Fe does not enter into the brucite-like layer, but mainly forms its own surface structures. 相似文献
10.
Churilov G. N. Vnukova N. G. Tomashevich E. V. Dudnik A. I. Glushchenko G. A. Dubinina I. A. Gulyaeva U. E. Mel’nikova E. I. 《Physics of the Solid State》2017,59(8):1662-1665
Physics of the Solid State - Yttrium-containing endohedral metallofullerenes are synthesized in an RF arc discharge in the helium flow with embedded Y2O3. It is shown that the formation of the... 相似文献
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