9:30 AM - 11:30 AM
▲ [12a-PA2-60] Clarification of Fe ordering in FexTiS2 structure using transmission electron microscopy
Keywords:intercalated transition metal dichalcogenides, scanning transmission electron microscopy, transmission electron diffraction
Iron-intercalated titanium disulfide (FexTiS2) is a material where Fe guest atoms are introduced into the van der Waals gaps of TiS2 nanosheets, thereby changing its atomic bonding and band structure, causing a deviation to its bulk properties. The physical properties of FexTiS2 were reported to be influenced by the distribution of Fe atoms in the van der Waals gap between TiS2 layers. However, the in-plane and inter-plane orders of Fe atoms are still open to dispute. In this study, we managed to clarify the arrangements of Fe atoms in FexTiS2 crystals through scanning transmission electron microscope (STEM) and transmission electron diffraction (TED) observation three dimensionally from the orientations of [100], [110] and [001] and created full atomic models for FexTiS2 for x = 0.33 and 0.25. √3a x √3a x 2c superlattice for x = 0.33 and 2a x 2a x 2c superlattice for x = 0.25 were observed clearly. We also found that the low Fe concentration of x = 0.15 had dominant short range ordering of √3a.