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Structural and thermoelectric properties of copper sulphide powders
摘要： Over the past few years, Cu-based materials have been intensively studied focusing on their structural and thermoelectric properties. In this work, copper sulphide powders were synthesized by the sol-gel method. The chemical composition and the morphological properties of the obtained samples were analyzed by X-ray diffraction, differential thermal analysis, and scanning electron microscopy. It is shown that the decomposition from one phase to another can be obtained by annealing. The electrical resistivity and the crystallite size were found to be strongly affected by the phase transition. Thermoelectric analyses showed that the digenite phase exhibits the highest power factor at room temperature. The Seebeck coefficient of the compound Cu1.8S shows a pronounced peak at the γ–β transition temperature. This behavior was statistically explained in terms of a dramatic increase in the disorder in the atoms-carriers ensemble.
关键词： thermoelectricity,copper sulphide,annealing temperature,phase transition
更新于2025-09-23 15:22:29
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Vacuum ultraviolet laser induced breakdown spectroscopy for detecting sulphur in thermally aged transformer insulation material
摘要： Spatially resolved and temporally integrated vacuum ultraviolet laser induced breakdown spectroscopy (VUV LIBS) was used for contaminant analysis in thermally aged oil impregnated pressboard (OIP) insulation material from high voltage transformers. The signature of copper sulphide contamination was obtained through detection of Cu and S emission lines. The plasma emission also contained highly ionized Oxygen and Carbon emission lines. S emissions were found to be strong in the VUV region in contrast to the UV-VIS region. The concentration of sulphur was found to increase with the duration of ageing of the OIP material.
关键词： copper sulphide,laser induced breakdown spectroscopy,Oil impregnated pressboard,vacuum ultraviolet,VUV,LIBS
更新于2025-09-11 14:15:04