2020年第67回応用物理学会春季学術講演会

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[12a-PA2-1~77] 17 ナノカーボン

2020年3月12日(木) 09:30 〜 11:30 PA2 (第3体育館)

09:30 〜 11:30

[12a-PA2-60] Clarification of Fe ordering in FexTiS2 structure using transmission electron microscopy

〇(D)Yi Ling Chiew1、Masanobu Miyata1、Mikio Koyano1、Yoshifumi Oshima1 (1.Japan Advanced Institute of Science and Technology)

キーワード: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.