Radiation-Thermal Effects and Processes in Inorganic Materials

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Authors: Anatoliy I. Kupchishin, Nataliya A. Voronova, Tatyana A. Shmygaleva, Alexander A. Kupchishin
Abstract: Computer simulation of vacancy clusters distribution by depth in molybdenum irradiated by alpha particles within Cascade probability method has been carried out. Cascade probability functions have been calculated taking into account energy losses for alpha particles in molybdenum and depending on number of interactions and depth of particles penetration. Microhardness comparison of calculations and modified experimental data show their satisfactory fit.
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Authors: Mariya Makarova, Konstantin Moiseev, Alexander Nazarenko, Petr Luchnikov, Galina Dalskaya, Natalya Katakhova
Abstract: Technological features of obtaining of tin films in a vacuum by liquid-phase target magnetron sputtering were reviewed. With high deposition rate the white color tin coating with amorphous structure is formed on the substrate. X-ray microanalysis of the obtained tin films showed the presence of micro-and nanoparticles of an impurity of the crucible material in the structure of the films. The use of the tantalum crucible with liquid-phase target magnetron sputtering with deposition rate of 3.2 μm / min allows obtaining ultra-pure, continuous, homogeneous tin film on a stationary substrate without impurity material of the crucible.
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Authors: Vladimir Ivchenko
Abstract: Diagnostics of the irradiated structure was carried out using the field ion microscopy technique. Modes of radiation exposure for development of amorphized states in subsurface regions of platinum are determined. It is shown that radiation exposure of pure metals with an energy of E = 30 keV under variation of the fluence of the charged argon ion beams by two orders of magnitude (1016 to 1018 ions/cm2) produces a significant effect on the kinetics of defect formation in the subsurface regions of irradiated materials. As a result of irradiation up to a higher fluence (F = 1017 ions/cm2), the effect of formation of the block nanocrystalline structure (at the block size of 1–5 nm) is observed in subsurface regions at a depth of at least 20 nm from the irradiated surface. It is found that the phenomenon of metal amorphization in the subsurface regions occurs up to a sample depth of 12 nm under an increase in the fluence to 1018 ions/cm2 and the above irradiation energies. Experimental results on atomic–spatial investigation of radiative defect formation in surface layers of materials, initiated by ion implantation (in Cu3Au: E = 40 keV, F = 1020 ion/m2, j = 10–3 A/cm2), are considered. The experimentally established average size of a radiation cluster (disordered zone) in the alloy after ion bombardment is 4 × 4 × 1.5 nm.
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Authors: Mikhail Afanasyev, Asaf Nabiev, Galina Chucheva, Dzhahangir Guseinov
Abstract: The paper considers formation of Ba0.8Sr0.2TiO3 ferroelectric films of MIS structures on silicon wafer with magnetron sputtering in HF discharge of the initial target material from the polycrystal ferroelectric in the oxygen atmosphere. Dielectric and volt-farad characteristics of MIS structures have been explored, depending on formation modes of Ba0.8Sr0.2TiO3 ferroelectric films. The authors determined technological modes of film deposition for acquiring MIS structures with the best electrophysical properties.
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Authors: Anatoliy I. Kupchishin, Buvkhan G. Taipova, Nataliya A. Voronova, Alexander A. Kupchishin, Kuanysh Shakhanov
Abstract: Experimental studies on the effect of electron irradiation with energy of 4 MeV to the mechanical strength of the film of Mylar type were conducted. It is found that the strain and stress dependences on the radiation dose are satisfactorily described by the proposed exponential models.
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Authors: Alexander I. Sechin, Andrey Sechin, Yuliya Amelkovich, Irina Mezenceva, Tatiyana A. Zadorozhnaya
Abstract: The analysis and necessity for studying of burning processes of systems formed by coal dust and methane for the purpose of development the effective activities on the enterprises of coal branch were shown. The results demonstrate the role of nonflammable components in the combustion processes of air suspension in heterogeneous systems. Also the dependence of the critical conditions creation for flame propagation in air suspension of sucrose from the average particle diameter at different temperatures of the ignition source is presented. The necessity of taking into account the experimental and methodological experience of other industries for the study of air suspension sensitivity to the initiating influence of the ignition source is explored. The requirements to the installation and methodology for studying the sensitivity of coal dust air suspension as one of the main factors preventing explosions of heterogeneous systems in the coal industry are formulated.
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Authors: Olga Dotsenko, Kirill Frolov, Dmitry Wagner, Veronika Dotsenko, Dmitry Aksentev
Abstract: In this study, Co0,7Zn1,3W powders were synthesized and investigated at the microwave region. The solid-state reaction method and self-propagating high-temperature synthesis were used to production of the two kinds of hexaferrite powders. The high-frequency magnetic properties under temperature effect have been studied. It is show, that there is a nonlinear dependence on temperature within the 0 – +40 °C temperature range.
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Authors: Gennady Bondarenko, Anna Gaidar, Ekaterina Gorelova, Nellie Kashirina
Abstract: The article is devoted to the investigation of the structure of pressed palladium-barium cathodes. These cathodes are made from a polycrystalline palladium matrix with inclusions of the particles of the activator phase Pd5Ba. The high efficiency and durability of pressed palladium-barium cathodes is ensured by the formation of an active-emission BaO layer on the working surface. The active metal Ba comes from the volume to the surface by diffusion of atoms on the defects of the crystal structure of the palladium matrix. When comparing the electrical parameters of the cathodes, the matrices of which were made from the same fractions but different batches of palladium powder, a considerable spread of electrical parameters was established. There were also revealed significant differences in the roughness of the cathode working surface. These differences affect the uniformity and stability of the emission current. This indicates the need for a detailed study of the characteristics of the initial palladium powder and their effect on the structure of the sintered material, and, consequently, on the physicomechanical properties of its surface. In this paper, the morphological features of eight batches of palladium powder in the initial state and after the purification annealing were studied by the method of electron microscopy. Significant differences in the form of particles and agglomerates of powder from different batches have been revealed. A metallographic analysis of microsections of the palladium samples prepared by solid-phase sintering was carried out. The influence of the morphological features of the particles of the initial powder on the grain size and the mechanical properties of the sintered compact is determined. Studies have shown that to obtain a compact palladium with reproducible and predictable properties, stability of the morphological characteristics of the original powder is necessary.
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Authors: Dmitrii Andreev, Gennady Bondarenko, Vladimir Andreev, Alexander Stolyarov
Abstract: In order to modify the gate dielectric of MIS structures we suggest to implement the injection-thermal treatment which consists in the high-field injection of electrons of set density into the thin dielectric film and the subsequent annealing of the structure. We investigate an influence of modes of the injection-thermal treatment onto the modification of MIS structures. We demonstrate that the processes of MIS structure modification taking place at the injection-thermal treatment in many respects are identical to the processes taking place at the radiation-thermal treatment. We study an influence of modes of the high-field electron injection into the gate dielectric of MIS structure onto densities of charge defects and the injection hardness of samples. Besides, we research an influence of doping of the silicone dioxide film by phosphorus onto the same characteristics.
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