Growing Cu2S Thin Films by Exposing a Copper Substrate to Gas-Phase Products of Brown Coal Hydrothermal Desulfurization

Thin films of copper(I) sulfide (Cu2S) are synthesized on a copper substrate by exposing it to vapor-phase sulfur-containing products resulting from the hydrothermal desulfurization of brown coal. The synthesized 0.1-mm-thick films have grain sizes in the range of 10‒20 μm, electrical resistivity ρ = 0.92 Ω cm at T = 300 K, and bang gap Eg = 1.91 eV. The roughness of the films, in terms of the arithmetic mean deviation of the assessed profile, is Ra = 2.46 μm. © 2018, Pleiades Publishing, Ltd

Growing Cu2S Thin Films by Exposing a Copper Substrate to Gas-Phase Products of Brown Coal Hydrothermal Desulfurization

Thin films of copper(I) sulfide (Cu2S) are synthesized on a copper substrate by exposing it to vapor-phase sulfur-containing products resulting from the hydrothermal desulfurization of brown coal. The synthesized 0.1-mm-thick films have grain sizes in the range of 10‒20 μm, electrical resistivity ρ = 0.92 Ω cm at T = 300 K, and bang gap Eg = 1.91 eV. The roughness of the films, in terms of the arithmetic mean deviation of the assessed profile, is Ra = 2.46 μm. © 2018, Pleiades Publishing, Ltd

Effect of Fusel Oils on Rheological Properties of Slurries of Coals at Different Metamorphic Stages

The salient technological properties of coal slurries are studied using fusel oil as the dispersion medium. The distinctive features of the rheological behavior and flow pattern of coal slurries as a function of the nature of coal are ascertained. It is shown that the effective viscosity of coal slurries decreases as the coal passes from the lignite to the anthracite stage. The calorific value and degree of combustion of coal slurries in fusel oil are higher than those of the original coal. © 2016 Springer Science+Business Media New Yor

Effect of Fusel Oils on Rheological Properties of Slurries of Coals at Different Metamorphic Stages

The salient technological properties of coal slurries are studied using fusel oil as the dispersion medium. The distinctive features of the rheological behavior and flow pattern of coal slurries as a function of the nature of coal are ascertained. It is shown that the effective viscosity of coal slurries decreases as the coal passes from the lignite to the anthracite stage. The calorific value and degree of combustion of coal slurries in fusel oil are higher than those of the original coal. © 2016 Springer Science+Business Media New Yor

Experimental Investigation and Thermodynamic Calculations of the Bi-Ge-Sb Phase Diagram

A phase diagram of the Bi-Ge-Sb ternary system was investigated experimentally by differential thermal analysis (DTA), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), and X-ray powder diffraction (XRD) methods and theoretically by the CALPHAD method. The liquidus projection; invariant equilibria; and three vertical sections, Sb-Bi0.5Ge0.5, Ge-Bi0.5Sb0.5, and Bi-Ge0.5Sb0.5, as well as isothermal sections at 773 K and 373 K (500 A degrees C and 100 A degrees C), were predicted using optimized thermodynamic parameters for constitutive binary systems from the literature. In addition, phase transition temperatures of the selected samples with compositions along calculated isopleths were experimentally determined using DTA. Predicted isothermal sections at 773 K and 373 K (500 A degrees C and 100 A degrees C) were compared with the results of the SEM-EDS and XRD analysis from this work. In both cases, good agreement between the extrapolated phase diagram and experimental results was obtained. Alloys from the three studied vertical sections were additionally analyzed using the Brinell hardness test