Belousov V.V.,RAS Institute of Metallurgy
MRS Communications | Year: 2013
Most important advances of the last years in research and development of oxygen ion transport membrane (ITM) materials based on solid or liquid Bi2O3 are briefly given. Special attention is paid to the transport properties of novel NiO/δ-Bi2O3 and In2O3/δ-Bi2O3 ceramic and ZnO/Bi2O3 solid/liquid composites. These composites show promise for use as ITM with the oxygen permeation rate comparable with that of the state-of-the-art membrane materials. The in situ Bi2O3 melt crystallization and grain boundary wetting methods of formation of the gas-tight composites are considered. © 2013 Materials Research Society .
Nechaev Y.S.,RAS Institute of Metallurgy
International Journal of Hydrogen Energy | Year: 2011
Thermodynamic and experimental backgrounds of the condensed hydrogen storage problem are considered. It results in developing an effective method of producing a high-density solid hydrogen carrier by means of hydrogen intercalation in carbonaceous nanomaterials at relevant temperatures and pressures (at the cost of the hydrogen association energy). This is a much more technological method, in comparison with the current megabar compression dynamic and static methods. As is also shown, one of the known processes of chemisorption of hydrogen in some carbonaceous nanostructures can be related to formation of graphane-like (i.e., carbohydride-like) nanoregions. By using gravimetric and electron microscopy data, the density values ( ρH=0.7±0.2g(H2)/cm3(H 2),ρH=0.28±0.08g(H2)/cm3(system)), of the intercalated solid molecular (i.e., reversible) hydrogen in graphane-like nanofibers (≥ 17 wt% H2) has been defined. It corresponds to a much more efficient hydrogen storage technology, in comparison with the current ones, and relevance to the U.S. DOE requirements and targets for 2015. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Leontyev V.,RAS Institute of Metallurgy
Physica Status Solidi (B) Basic Research | Year: 2013
Nanoparticles of pure Ni and Ni-Cu solid solution were synthesized by the sol-gel method at 400-600°C. The particle sizes and values of specific surface of powders were dependent on the synthesis temperature. The magnetization of the obtained powders was studied using a high-temperature magnetic balance. The Curie temperature for particles of pure nickel did not depend on their size but the specific magnetization at 300K decreased linearly with increasing specific surface area of particles. For particles of the Ni-Cu binary solid solutions, the Curie temperature and values of magnetization increased with decreasing particle size for particles with diameters up to values less than 100nm. The amount of adsorbed copper on the particles surface, the change of nickel concentration in the volume of the particles and the Curie temperatures, depending on the Cu (Ni) concentration in a volume of particles, were calculated using the Gibbs equation. The calculations made in the framework of a perfect solution showed qualitative agreement between experimental and calculated values of the Curie temperature for the system Ni-Cu. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Ryltsev R.E.,RAS Institute of Metallurgy |
Chtchelkatchev N.M.,Moscow Institute of Physics and Technology |
Ryzhov V.N.,Moscow Institute of Physics and Technology
Physical Review Letters | Year: 2013
We investigate glassy dynamical properties of one-component three-dimensional system of particles interacting via pair repulsive potential by the molecular dynamic simulation in the wide region of densities. The glass state is superfragile and it has high glass-forming ability. The glass transition temperature Tg has a pronounced minimum at densities where the frustration is maximal. © 2013 American Physical Society.
Korzhuev M.A.,RAS Institute of Metallurgy
Journal of Electronic Materials | Year: 2010
Symmetry analysis has been applied to thermoelectric energy converters [thermoelectric generators (TEG), coolers (TEC), and heaters (TEH)] with inhomogeneous legs. The features of the crystallographic symmetry of thermoelectric materials and the symmetry of legs, thermocouples, and modules are studied. The effect of symmetry on the figure of merit Z of thermoelectric energy converters is considered. A general rule for proper placement of legs in thermoelectric converters is developed. A modified tetratomic classification for thermoelectric energy converters with inhomogeneous legs (TEG a, TEG b, TEC, and TEH) is proposed. An increase in Z for thermoelectric energy converters with inhomogeneous legs is due to the bulk thermoelectric effect. An increase in Z gives the reduction of irreversible processes in the modules (Joule heating and thermal conductivity), accompanying breaking of the symmetry of the legs. It is found that violations of the symmetry requirements can lead to significant energy losses in converters. © 2010 TMS.
Pogorelova A.V.,RAS Institute of Metallurgy
Proceedings of the 10th (2012) ISOPE Pacific/Asia Offshore Mechanics Symposium, PACOMS 2012 | Year: 2012
This paper studies the three-dimensional unsteady problem of the hydroelastic behavior of a floating infinite plate under the impact of waves generated by moving loads on ice plate in conditions of sloped bottom. An analytic solution of the problem is found by integral transformations and asymptotic expansions. The amplitude is analyzed for various values of bottom slope, basin depth, plate thickness, vehicle length, deceleration and acceleration coefficients. © 2012 by International Society of Offshore and Polar Engineers.
Belousov V.V.,RAS Institute of Metallurgy
Corrosion Science | Year: 2010
An electrochemical mechanism of hot corrosion of the Bi2O3-deposited copper is proposed. Oxygen ion transport across the oxide scale with liquid-channel grain-boundary structure (LGBS) is the rate-limiting step in the overall mechanism. The calculated and experimental values of the rate constant for hot corrosion of Bi2O3-deposited copper are of the same order of magnitude, which shows agreement between theory and experiment. © 2009 Elsevier Ltd. All rights reserved.
Vorob'ev V.P.,RAS Institute of Metallurgy
Steel in Translation | Year: 2015
The reducing agents employed in ferroalloy production are classified for the first time on the basis of their primary physicochemical properties in slag-free (FeSi, FeSiCr, FeSiMn) and slag-based (FeCr, FeMn) processes. The goal of the classification is to improve the production process. © 2015, Allerton Press, Inc.
Ivanova L.D.,RAS Institute of Metallurgy
Inorganic Materials | Year: 2011
Rhenium-doped higher manganese silicide based materials have been prepared by hot pressing. It has been shown that the pressing temperature of the materials can be lowered by adding titanium as a reductant or by sonication during pressing. The average thermoelectric figure of merit of the materials in the temperature range 600-900 K is Z ≈ 0.7 × 10 -3 K -1. © 2011 Pleiades Publishing, Ltd.
Barinov S.M.,RAS Institute of Metallurgy
Russian Chemical Reviews | Year: 2010
The topical problems in chemistry and technology of materials based on calcium phosphates aimed at both the replacement of damaged bone tissue and its regeneration are discussed. Specific features of the synthesis of nano-crystalline powders and the fabrication of ceramic implants are described. Advances in the development of porous scaffolds from resorbable and osteoconductive calcium phosphates and of hybrid composites that form the basis of bone tissue engineering are considered. © 2010 Russian Academy of Sciences and Turpion Ltd.