FABRICATION AND CHARACTERIZATION SINGLE CRYSTAL OF FEPS3 LAYERED MATERIAL

Abstract: Single crystal of layered material, FePS3, grows inside sealed and evacuated silica tube. The FePS3 forms at 650°C under a controlled heating rate. X-ray diffraction (XRD), Scanning electron microscope (SEM) and transmission electron microscope (TEM) have been used to study the crystal structure and morphology. The XRD pattern exhibits sharp 001 reflections of the single crystal alloy sheet. The prepared samples exhibit high thermal stability with a decomposition temperature of 780 °C. The SEM images show smoothness of the single crystal sheets. Corrosion behavior was investigated by using open circuit potential, Tafel polarization and cyclic voltametry in presence of 10% hydrochloric acid. The crystal open circuit potential shifts to the nobler direction. There is a passive region in the anodic branch of the polarization curve. The presence of the passive region reflects high corrosion resistance. This behavior of high corrosion resistance can be rationalized on the basis that single crystals are free from grain boundaries.

Keywords: Layered materials, FePS3; Single Crystal; XRD; Electrochemical Behaviour.