Comparative thermodynamic investigation of binary Ga-Bi system; Experimental determination of enthalpies of mixing and activity estimation for liquid Ga-Bi alloys

Flower-like copper sulfides nanostructures were synthesized via the solvothermal route. The structural, optical and electrochemical properties of the synthesized materials were characterized by means of X-ray diffraction (XRD), scanning electron microscopy, ultraviolet-visible spectrometry and Fourier transform infrared spectroscopy (FTIR). Thermal behavior of the obtained flower-like materials was analyzed by TG, XRD and FTIR in situ measurements, over the temperature range of 25-800°C. It was found that both shape and phase composition remain stable until the temperature reaches 200°C. Phase transformation mechanism was discussed. During annealing, mixture of CuS and Cu 1.8 S is converted to copper sulfide hydroxides (200-500°C) and further to CuO (700°C and higher). Nevertheless, hierarchically porous structure is stable only to 200°C. Applying higher temperatures affects the solubility of the material and inflicts structural damage, resulting in the formation of dense oval particles with size of 20 to 200 nm.

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Thermodynamic modelling of the ternary Bi-Ga-Te system for potential application in thermoelectric materials

Kumar

Tiwary

Paek

et al. 2021

Calphad

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Comparative thermodynamic investigation of binary Ga-Bi system; Experimental determination of enthalpies of mixing and activity estimation for liquid Ga-Bi alloys

Cited by 11 publications

References 21 publications

Evolved gas analyses on a mixed valence copper(I,II) complex salt with thiosulfate and ammonia by in situ TG-EGA-FTIR and TG/DTA-EGA-MS

Evolved gas analyses on a mixed valence copper(I,II) complex salt with thiosulfate and ammonia by in situ TG-EGA-FTIR and TG/DTA-EGA-MS

Synthesis of anisotropic Cu2−xS-based nanostructures by thermal oxidation

Thermodynamic modelling of the ternary Bi-Ga-Te system for potential application in thermoelectric materials

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