AZINE-GRAPHENE-DYAD: SYNTHESIS AND PROPERTIES

This work was supported by the Russian Science Foundation, project № 22-13-00298

DETERMINATION OF 1-ETHYL-3-METHYLIMIDAZOLIUM CHLORALUMINATE IONIC COMPOSITION BY RAMAN SPECTROSCOPY

Получены спектры комбинационного рассеяния (КР) ионной жидкости состава AlCl3 / 1-этил-3-метилимидазолий хлорид ([EMIM]Cl) с мольными отношениями 1; 1,5; 2. По данным спектров определено наличие ионов [EMIM]+, AlCl4- и Al2Cl7-, и установлена тенденция изменения концентрации заряженных частиц в зависимости от содержания AlCl3 в исследуемом электролите.Raman spectra of the AlCl3/1-ethyl-3-methylimidazolium chloride ([EMIM]Cl) ionic liquid with a molar ratio of 1; 1.5; 2 were obtained. According to the Raman spectroscopy data the presence of [EMIM]+, AlCl4- and Al2Cl7- ions were determined. It was established that the charged particles concentration depends on the AlCl3 content in the studied electrolytes

Conditions of hydrochemical synthesis, composition, and structure of tellurium films

Conditions of the hydrochemical synthesis of thin tellurium fi lms by reduction of an aqueous solution of tellurous acid with hydrazine were determined. The redox potentials of tellurous acid and hydrazine and their difference in relation to pH of the medium and concentration of tellurite ions were calculated. The kinetics of tellurium layer growth on glass-ceramic substrates and the structure, composition, and morphology of the layers were studied. © 2012 Pleiades Publishing, Ltd

Structure peculiarities of carbon-coated lithium titanate: Raman spectroscopy and electron microscopic study

Li 4Ti 4.92(CrV) 0.04O 12/C composites were synthesized at 800 °C under a flow of argon/acetylene gas mixture taken in the 40:1volumetric ratio. X-ray diffraction (XRD), thermogravimetric analysis (TGA), magnetic susceptibility, Raman spectroscopy, and electron microscopy (TEM) were used to characterize the phase structure, composition, and morphology of the composites. Transmission electron microscopy and Raman spectroscopy confirmed that carbon exists on the surface of the spinel matrix. The composites proved to have a modified structure in comparison with the pristine spinel phase. © 2011 Elsevier Masson SAS. All rights reserved

Thermodynamic properties and phase equilibriums in ternary alloys of the Al-C-3D-metal systems

The thermodynamic properties of liquid alloys of the 3d-Me-C systems are calculated using the described algorithm and some experimental data. The analysis of own and literary data has allowed to establish the most reliable mixing enthalpies of binary boundary systems Al-3d-metal. This allowed to estimate the thermodynamic properties of ternary alloys of the Al-C-Sc(Ti, V, Cr, Mn, Fe, Co, Ni, Cu) systems by Kohler equation and to find a regularity of its changing

Solid Electrolyte Membranes Based on Li2O–Al2O3–GeO2–SiO2–P2O5 Glasses for All-Solid State Batteries

Rechargeable Li-metal/Li-ion all-solid-state batteries due to their high safety levels and high energy densities are in great demand for different applications ranging from portable electronic devices to energy storage systems, especially for the production of electric vehicles. The Li1.5Al0.5Ge1.5(PO4)3 (LAGP) solid electrolyte remains highly attractive because of its high ionic conductivity at room temperature, and thermal stability and chemical compatibility with electrode materials. The possibility of LAGP production by the glass-ceramic method makes it possible to achieve higher total lithium-ion conductivity and a compact microstructure of the electrolyte membrane compared to the ceramic one. Therefore, the crystallization kinetics investigations of the initial glass are of great practical importance. The present study is devoted to the parent glasses for the production of Li1.5+xAl0.5Ge1.5SixP3−xO12 glass-ceramics. The glass transition temperature Tg is determined by DSC and dilatometry. It is found that Tg decreases from 523.4 (x = 0) to 460 °C (x = 0.5). The thermal stability of glasses increases from 111.1 (x = 0) to 188.9 °C (x = 0.3). The crystallization activation energy of Si-doped glasses calculated by the Kissinger model is lower compared to that of Si-free glasses, so glass-ceramics can be produced at lower temperatures. The conductivity of the glasses increases with the growth of x content