Possessing a high complex of mechanical and functional properties: tensile strength, hardness, wear resistance, corrosion resistance, heat resistance and bio-inertness, Al2O3–ZrO2 systems are an effective material used for the manufacture of products that operate in harsh conditions. The main problem with currently used production methods is the limitations caused by the aggregability of particles. One of the approaches to reducing the degree of their aggregation is the use of organic or mixed aqueous-organic media. At the same time, the question of the influence of the solvent on the phase composition and structure of the forming precursor of the oxide system remains open. In this regard, the aim of the work is to identify patterns of influence of the solvent composition and electrolysis conditions on the chemical and phase composition of the final product and some of its physicochemical characteristics. The synthesis of precursors of oxide systems was carried out using a diaphragm-free coaxial electrolyzer reactor, where the cathode is Kh18N10T steel, and the soluble anode is 99.95
A 40Bi2O3–30Li2O–15B2O3–7CuO–5TeO2–3MoO3 glass was synthesized by melt-quenching at 1200°C to investigate its structural, thermal, dielectric, and basic physical properties as a Bi2O3-rich oxide glass with potential relevance to thermoelectric research. Density and molar volume determined by Archimedes’ method were 4.63 g cm–3 and 48.28 cm3 mol–1, respectively, indicating a relatively compact glass network influenced by heavy metal oxides. X-ray diffraction confirmed the amorphous nature of the sample. Fourier-transform infrared spectra revealed vibrations associated with BO3 and BO4 units and borate-related species (including metaborate- and pyroborate-type units), consistent with a borate-based network modified by Bi2O3, CuO, and TeO2; however, boroxol rings cannot be assigned unambiguously from the present spectra. Differential scanning calorimetry conducted between room temperature and 650°C showed a glass transition near 420°C and no strong crystallization peak in this range, indicating good thermal stability at moderate temperatures. The dielectric response, measured between 100 Hz and 1 MHz, exhibited high capacitance and permittivity at low frequencies, followed by a marked decrease with increasing frequency, which can be attributed to the progressive freezing of ionic and interfacial polarization and is consistent with Maxwell-Wagner type behaviour. These results provide baseline information on the structure, thermal behaviour, and dielectric properties of this Bi2O3-rich glass composition and indicate that further work, including direct measurements of electrical resistivity, Seebeck coefficient, and thermal conductivity, is required before its thermoelectric performance can be fully assessed.
The samarium-doped ceria Sm0.2Ce0.8O2 – ⸹ electrolyte was synthesized by the co-precipitation method. XRD analysis confirmed the phase structure of the prepared electrolyte, which exhibited a cubic structure, with crystallite size varying from 22‒34 nm. SEM micrographs indicate homogenous, closely packed spherical grains and a relatively dense structure. Raman and UV–visible spectroscopy were used to observe molecular vibration and absorption. The electrolyte powder sintered at 1000°C showed a maximum ionic conductivity of 0.11 S cm–1 at 600°C in air.
The combined effect of fluoride (F–) and titanium (Ti4+) ions on the formation of hydrosilicate nanotubes under hydrothermal conditions. It was found that titanium ions can be incorporated into the crystalline structure of hydrosilicates and occupy positions within the nanotube channels. It was revealed that the temperature and the ratio of reagents in the hydrothermal fluid significantly affect the phase composition of the synthesis products, determining the phase ratio of hydrosilicates and titanium-containing components.
This paper presents the results of a study on the controlled formation and comprehensive diagnostics of hybrid halide perovskite films for use in solar energy. The main focus is on the development of a technological approach that allows for targeted control of the morphology of the active layer at the synthesis stage. Films of the composition CH3NH3PbI3 (MAPbI3) modified with monoethanolammonium lead iodide (HOC2H4NH3PbI3, MEAPbI3) additives were obtained by centrifugation from dimethylformamide (DMF)-based solutions). It was shown that the electrophysical characteristics, correlating with the experimental values of the fractal dimension, change with changing the concentration of additives and effects on the fractal dimension. Varying the additive concentration of the (0–70
