Abstract Based on literature data, with the additional calculations are selected most reliable data for the thermodynamic parameters of crystal silver selenide, germanium and silver selenogermanate: 0 298 H D (a-Ag2Se)= −43.5, 0 298 H D (GeSe,cr)=−82.9, 0 298 H D (GeSe2,cr)=−103.7, 0 298 H D (a- Ag8GeSe6,cr)=−290.4, 0 298 G D (a-Ag2Se)=−50.3, 0 298 […]
Abstract Phase equilibria in the PbTe-AgSbTe2 section of the quasiternary Ag2Te-PbTe-Sb2Te3 system were studied by means of differential-thermal and X-ray analyses, as well as microhardness measurements. For investigations, two series of alloys of the explored section were prepared by two different ways. Based on the experimental data, the T-x diagram of the PbTe-AgSbTe2 section was […]
Abstract The paper deals with the results of research into phenol cycloalkenylation with 3- vinylcyclohexene in the presence of modified zeolite-containing catalyst Zeokar-2M on the laboratory batch unit and aminomethylation of the obtained p-(cyclohexene-3-yl-ethyl) phenol with formaldehyde and aniline. The temperature effects, reaction time, molar ratio of phenol to vinylcyclohexene (VCH) and amount of the […]
Abstract The study is focused on the synthesis and characterization of (La0.75Ca0.25)0.95Cr1-xFexO3-δ (x = 0.3 – 0.9)perovskites as potential materials for solid oxide fuel cell (SOFC) cathode and anode. These materials possessanorthorhombically-distorted structure at room temperature whilst heating above 800- 1100 K induces reversible transformation into the rhombohedral symmetry. The transition temperature increases with iron […]
Abstract This review is devoted to analysis of the possibility to use electrochemical energy systems at low temperatures. It is not possible to attain this goal without ecologically pure autonomous energy sources – chemical current sources capable of operating at temperatures up to –60 °C which are presently under development. Renewable energy systems combined with […]