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12 results on '"Sherstobitova, Elena A."'

1. Influence of Structural Disorder on the Magnetic Order in FeRhCr Alloys

Author

Komlev, Aleksei S., Cabeza, Gabriela F., Chirkova, Alisa M., Ukrainczyk, Neven, Sherstobitova, Elena A., Zverev, Vladimir I., Gimaev, Radel, Baranov, Nikolai V., Perov, Nikolai S., Komlev, Aleksei S., Cabeza, Gabriela F., Chirkova, Alisa M., Ukrainczyk, Neven, Sherstobitova, Elena A., Zverev, Vladimir I., Gimaev, Radel, Baranov, Nikolai V., and Perov, Nikolai S.

Abstract

Magnetic phase transitions in alloys are highly influenced by the sample preparation techniques. In the present research, electronic and magnetic properties of Fe48Cr3Rh49 alloys with varying cooling rates were studied, both experimentally and theoretically. The degree of crystalline ordering was found to depend on the cooling rate employed after annealing the alloy. Modeling of alloy structures with different degrees of crystalline ordering was carried out via strategic selection of substitution positions and distances between chromium atoms. Theoretical calculations revealed significant changes in magnetic and electronic properties of the alloy with different substitutions. A comprehensive analysis of the calculated and experimental data established correlations between structural characteristics and parameters governing the magnetic phase transition. In this study, we also developed a method for evaluating the magnetic properties of the alloys obtained under different heat treatments. The proposed approach integrates atom substitution and heat treatment parameters, offering precise control over alloy manufacturing to effectively tune their essential magnetic properties.

Published
2024

7. Phase Relations in a NaFeO 2 -SnO 2 (0–50 mol.% SnO 2) System and the Crystal Structure and Conductivity of Na 0.8 Fe 0.8 Sn 0.2 O 2.

Author

Shekhtman, Georgiy S., Sherstobitova, Elena A., Shchelkanova, Mariya S., and Ilyina, Evgenia A.

Subjects
*CRYSTAL structure, *TIN, *STANNIC oxide, *SOLID electrolytes, *SODIUM ions, *POLYMERIC membranes, *SUPERIONIC conductors
Abstract

With the view of developing new materials for sodium and sodium-ion power sources, NaFeO2-SnO2 (0–50 mol.% SnO2) powders were synthesized using a solid state method, and their phase composition and crystal structure were studied. A phase of the Na0.8Fe0.8Sn0.2O2 composition with a layered rhombohedral structure of the α-NaFeO2 type was found when the tin dioxide content was 20 mol.%. The phase produced was of an O3 structural type. O3-type phases have sufficiently good performance when used as cathode materials in sodium-ion batteries and, moreover, often have a rather high sodium-cation conductivity. A two-dimensional migration map was built using Voronoi–Dirichlet partition and TOPOS software package. The sodium-ion conductivity of Na0.8Fe0.8Sn0.2O2 at room temperature was rated low (10−8 S × cm−1 at 20 °C), which may be the result of channels too narrow for Na+ migration. The results obtained show that the application of the compound studied in this work as a solid electrolyte in sodium power sources is unlikely. It is the potential use of Na0.8Fe0.8Sn0.2O2 as the active material of cathodes in Na and Na-ion power sources that presents practical interest. [ABSTRACT FROM AUTHOR]

Published
2022
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11. Effect of AO Segregation on Catalytical Activity of La0.7A0.3MnO3±δ (A = Ca, Sr, Ba) Regarding Oxygen Reduction Reaction.

Author

Porotnikova, Natalia M., Eremin, Vadim A., Farlenkov, Andrey S., Kurumchin, Edhem Kh., Sherstobitova, Elena A., Kochubey, Dmitry I., and Ananyev, Maxim V.

Subjects
OXIDATION-reduction reaction, MANGANESE oxides, ISOTOPE exchange reactions, GAS phase reactions, SOLID oxide fuel cells
Abstract

Oxygen surface exchange kinetics of La0.7A0.3MnO3±δ has been studied by the isotope exchange method with gas phase equilibration using a static circulation experimental rig at the temperature of 850 °C and oxygen pressure of 1 kPa. Oxides of La0.7A0.3MnO3±δ with different dopant at one level of doping were considered. Rates of elementary acts of the oxygen exchange were found to change differently. So, the oxygen dissociative adsorption rate increased, the oxygen incorporation rate decreased, and the increase in the cation radius did not influence the interphase exchange rate. These trends are associated with the AO segregation processes at the surface and the appropriate mechanism of oxygen reduction is considered.Graphical Abstract: The oxygen dissociative adsorption rate increased, the incorporation rate decreased, and the increase in the cation radius did not influence the interphase exchange rate. These trends are associated with the AO segregation processes at the surface. [ABSTRACT FROM AUTHOR]

Published
2018
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