| Summary: | This paper describes the synthesis of tungsten disulfide (WS<sub>2</sub>) powder by the sulfurization of tungsten trioxide (WO<sub>3</sub>) particles in the presence of additive potassium carbonate (K<sub>2</sub>CO<sub>3</sub>) in nitrogen (N<sub>2</sub>) atmosphere, first at lower temperature (200 °C) and followed by reduction at higher temperature (900 °C). In addition, the ultrasonic spray pyrolysis of ammonium meta-tungstate hydrate (AMT) was used for the production of WO<sub>3</sub> particles at 650 °C in air. The HSC Chemistry<sup>®</sup> software package 9.0 was used for the analysis of chemistry and thermodynamic parameters of the processes for WS<sub>2</sub> powder synthesis. The crystalline structure and phase composition of all synthesized powders were analyzed by X-ray diffraction (XRD) measurements. The morphology and chemical composition of these samples were examined by scanning electron microscopy (SEM) combined with energy dispersive X-ray analysis (EDX).
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