Comparative characterization to the three kinds of solid-shape FeS

The microstructures of three kinds of the synthetical solid FeS, acting as the solid lubricant, which includes FeS bulk, FeS particles and FeS powder, were studied in this article. Their surface morphologies were investigated with SEM, and XRD was used to study the phase structures, TEM was utilized to observe the micro-morphologies and analyze the microstructures. The results showed that the crystals of solid FeS were composed of many hexagonal single crystals and multi-crystals, with two kinds of crystalline structure, hexagonal structure and face-centered cubic structure. The surface of FeS was in the shape of a floccule except for a little granular figure. The micro-morphology of FeS presented irregular flakes which can be seen from TEM pictures, the size of grains ranging between 0.1 μm and 3 μm.