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1.
E. A. Budovskikh A. Ya. Bagautdinov A. V. Vostretsova V. E. Gromov 《Russian Physics Journal》2008,51(5):517-530
The kinetics of the electrical explosion of foils has been investigated and the parameters of the plasma jet, the radius of
the plasma-affected zone, the pressure and temperature of the plasma in the shock-compressed layer near the irradiated surface,
and the accepted power density at the jet axis have been calculated in relation to the dimensions of the plasma accelerator,
the distance from the nozzle exit section to the irradiated surface, and the charge voltage of the energy store. Modes of
electrical explosion alloying of metals have been determined experimentally which are associated with surface melting, splashing
of melt, effects of convective heat and mass transfer, aftereffect, and also with physicochemical and physicomechanical features
of the materials used. Methods of optical, scanning, and transmission electron diffraction microscopy have been used to examine
the relief, phase composition, and defect substructure of the surface layers of metals after various types of one-and two-component
electrical explosion alloying. A multilayer structure has been revealed which is characterized by the degree of variation
of the phase-structure state and of the material mechanical characteristics. Based on the features of the multiphase jet that
serves as a tool for affecting the surface, some propositions have been made on the physical nature of the processes occurring
in a material subject to electrical explosion alloying.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 71–83, May, 2008. 相似文献
2.
B. Sh. Bagautdinov I. D. Brown Yu. I. Yuzyuk V. P. Dmitriev 《Physics of the Solid State》2001,43(2):350-354
The temperature behavior of lattice parameters and diffraction patterns of the reciprocal lattice in Cs2HgCl4 crystals is studied by x-ray diffraction in the temperature range from 4.2 to 300 K. A sequence of phase transitions is observed and attributed to the evolution of incommensurate and commensurate modulations along the crystallographic a and c axes of a unit cell in the initial Pnma structure. 相似文献
3.
Yu. I. Blokhin I. A. Khotina V. A. Karnoukhova I. A. Lyubimov A. M. Bagautdinov I. A. Abramov 《Russian Journal of Coordination Chemistry》2016,42(6):372-377
Copper(I) halide complexes with phenylphosphonous diamide ligand (L), C56H100Br4Cu4N8P4 (II) and C56H100Cu4I4N8P4 (III), were synthesized and studied by X-ray diffraction to determine their molecular and crystal structures (CIF files CCDC nos. 1426622 (II), 1426623 (III)). The prepared coordination compounds are cubane-like tetramers like L4Cu4X4. During the reaction, copper(I) is coordinated to the phosphorus atom of ligand L. The stability of the complexes depends considerably on the halogen atom. The iodide complexes are most stable during storage. 相似文献
4.
V. Sedykh V. Sh. Shekhtman I. S. Smirnova B. Sh. Bagautdinov E. V. Suvorov A. V. Dubovitskii 《Physica C: Superconductivity and its Applications》2003,390(4):311-320
The single-crystalline specimens of the Fe-doped (5% 57Fe) Bi2Sr2CaCu2O8 (2212Cu) compound have been synthesized to compare the behavior of the structure modulation in Bi-cuprate and Bi-ferrate compounds. According to the Mössbauer data obtained, one can conclude that extra oxygen, related to the presence of Cu3+ in 2212Cu, is most probably arranged in the Ca layer rather than in the Bi layer, as was supposed in the model of extra oxygen. Based on the analysis of the experimental data we propose the explanation of the structure modulation in Bi compounds. Due to the mismatch between the internal perovskite block and the external BiO layers the structure of the Bi compounds is distorted. The Sr layer being boundary between these blocks probably is most distorted and stressed. We suppose that the different changes related to the modulation can occur just in this layer. The Bi excess, which is always present in Bi compounds (especially in single crystals), can be just the necessary condition at which the modulation appears. Extra oxygen in principle can be present in modulated structures. However, in our opinion, it only complements the influence of other factors and is not the driving force in the structure modulation. 相似文献
5.
A. Ya. Bagautdinov E. A. Budovskikh Yu. F. Ivanov E. V. Martusevich V. E. Gromov 《Russian Physics Journal》2005,48(9):929-935
Surface relief, phase composition and defect substructure of the surface layer of iron specimens are investigated using scanning
and transmission electron microscopy after high-energy electroexplosive carburizing treatment. The structure formed is shown
to exhibit a conspicuous gradient character resulting from variations in carbon content with the layer depth. It is found
out that a liquid melt of the sublayer of nanocrystalline structure is formed at the boundary of the melt pool.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 36–41, September, 2005. 相似文献
6.
Yu. I. Blokhin K. N. Kornilov A. V. Akilin I. A. Abramov A. M. Bagautdinov I. A. Lyubimov 《Russian Chemical Bulletin》2016,65(4):910-922
The data on the synthesis, structure, and chemical properties of bisphosphorylated dihydric phenols are summarized. All the currently known methods for the synthesis of the systems in question are shown. Specific features of their structure, chemical and complexation properties, as well as areas of application of these compounds were analyzed. 相似文献
7.
The residual incommensurate modulations in the ferroelectric phase of the SC(NH2)2 thiourea are investigated using single-crystal x-ray diffractometry. It is found that the structural states of the ferroelectric phase (T<169 K) depend on the thermal prehistory of the crystal in the temperature range of existence of the incommensurate phase (202-169 K). The dielectric anomaly observed at T x=161 K is justified structurally. 相似文献
8.
R. R. Bagautdinov S. O. Stepanova V. I. Korotkov B. N. Korvatovskii V. V. Akulinichev 《Journal of Applied Spectroscopy》1999,66(4):617-621
The luminescence and excitation spectra and kinetic characteristics of the luminescence of the adsorbates of magnesium phthalocyanine
(MgPhc) on SiO2 and the effect on them of surface hydration and finely dispersed platinum are studied. It is found that a structure that
improves hydration of the adsorbent surface appears on the platinized surface in the luminescence and excitation spectra.
It is assumed that the spectral structure is due to the complexes of MgPhc formed with water molecules, the hydroxyl cover
of the surface, and the surface centers of SiO2 modified by a Pt-catalyst.
Reported at the VIIIth International Conference on Spectroscopy of Porphyrins and Their Analogs, Minsk, September 22–26, 1998.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 4, pp. 552–555, July–August, 1999. 相似文献
9.
X-ray diffraction is used to study the temperature dependence of the lattice parameters and the sequence of structural realignments
in crystalline Rb2ZnCl4 over temperatures of 4.2–310 K. The appearance of and changes in the system of satellite reflexes indicative of structural
ordering are studied. Below 74 K, on going into the monoclinic phase (space group A11a), anomalies are observed in the behavior of the lattice parameters, and superstructural reflexes develop with wave vectors
q=a
*/3+b
*/2+c
*/2 corresponding to an increase by a large factor in initial parameters a, b, and c of the Pnma-phase.
Fiz. Tverd. Tela (St. Petersburg) 41, 1084–1090 (June 1999) 相似文献
10.
M. S. Novikova I. P. Makarova M. K. Blomberg B. Sh. Bagautdinov I. P. Aleksandrova 《Crystallography Reports》2001,46(1):26-29
The atomic structure of Cs3Sb2I9 single crystals was refined using X-ray diffraction data (sp. gr. P3m1; wR = 1.58% and R = 3.07%). The phase transitions revealed earlier were found to be accompanied by the appearance of superstructural reflections. At T c1 = 86 K, the reflections indicating doubling of the c parameter. At T c2 = 73 K, a first-order phase transition takes place accompanied by “freezing” of the satellites h, k + 1/2, l + 1/2 reflections. In the temperature range from 73 to 78 K, an incommensurate phase providing the satellites h, k + 1/2 + δ, l + 1/2 is formed. 相似文献