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Your search keyword '"Georgiy Sh. Shekhtman"' showing total 2 results
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2 results on '"Georgiy Sh. Shekhtman"'

1. Lithium-Cation Conductivity of Solid Solutions in Li6-xZr2-xAxO7 (A = Nb, Ta) Systems

Author

Georgiy Sh. Shekhtman, Anastasia V. Kalashnova, and Boris D. Antonov

Subjects
solid electrolytes, lithium zirconates, lithium cation conductivity, crystal structure, glycine-nitrate synthesis, heterovalent doping, Technology, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Engineering (General). Civil engineering (General), TA1-2040, Microscopy, QH201-278.5, Descriptive and experimental mechanics, QC120-168.85
Abstract

Li6-xZr2-xAxO7 (A = Nb; Ta) system with 0 < x < 0.30 is synthesized by glycine-nitrate method. Boundaries of solid solutions based on monoclinic Li6Zr2O7 are determined; temperature (200–600 °C) and concentration dependences of conductivity are investigated. It is shown that monoclinic Li6Zr2O7 exhibits better transport properties compared to its triclinic modification. Li5.8Zr1.8Nb(Ta)0.2O7 solid solutions have a higher lithium-cation conductivity at 300 °C compared to solid electrolytes based on other lithium zirconates due the “open” structure of monoclinic Li6Zr2O7 and a high solubility of the doping cations.

Published
2021
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2. Physico-Chemical Properties of NaV3O8 Prepared by Solid-State Reaction

Author

Georgiy Sh. Shekhtman, Mariya S. Shchelkanova, E. G. Vovkotrub, and S. V. Pershina

Subjects
sodium–vanadium oxides, solid state synthesis, Technology, Materials science, Scanning electron microscope, Analytical chemistry, Conductivity, Article, symbols.namesake, X-ray photoelectron spectroscopy, General Materials Science, Thermal stability, sodium power sources, cathode materials, Microscopy, QC120-168.85, Aqueous solution, QH201-278.5, Atmospheric temperature range, Engineering (General). Civil engineering (General), TK1-9971, Dielectric spectroscopy, Descriptive and experimental mechanics, symbols, Electrical engineering. Electronics. Nuclear engineering, TA1-2040, Raman spectroscopy
Abstract

Sodium–vanadium oxide NaV3O8 is synthesized via solid-state method and optimum synthesis conditions are chosen based on the data of DSC and TG analysis. The material synthesized is characterized by X-ray phase analysis, Raman spectroscopy and scanning electron microscopy. The ratio V4+/V5+ in the sample obtained is determined by X-ray photoelectron spectroscopy. Conductivity of the material synthesized was measured by impedance spectroscopy, pulse potentiometry and DC method over the range RT–570 °C. It is shown that NaV3O8 has rather high conductivity essentially electron in type (6.3 × 10−2 at room temperature). AC and DC conductivity measurements are performed and cycling of symmetricNaV3O8|Na3.85Zr1.85Nb0.15Si3O12|NaV3O8 cell in galvanostatic conditions. Thermal stability is studied across 25–570 °C temperature range. The results obtained are compared with the properties of NaV3O8 produced via aqueous solution.

Published
2021

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