Ordering of Intercalated Fe Atoms in Fe_xTiS₂ Structures Clarified Using Transmission Electron Microscopy

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Yi Ling Chiew, Masanobu Miyata

, Mikio Koyano, and Yoshifumi Oshima

+ Affiliations

School of Materials Science, Japan Advanced Institute of Science and Technology, Nomi, Ishikawa 923-1292, Japan

Received March 11, 2020; Accepted May 20, 2020; Published June 12, 2020

The various physical properties of titanium disulfide (TiS₂) crystals with intercalated iron (Fe) are reported to be influenced by the distribution of Fe atoms in the van der Waals gap between TiS₂ layers. However, the distribution of Fe atoms in-plane and inter-plane is still open for dispute. Here, the ordering of intercalated Fe atoms in Fe_xTiS₂ structures is clarified using transmission electron diffraction and scanning transmission electron microscopy. At low concentration of x = 0.15, only short range orders of \(\sqrt{3} a\) or 2a are found within the layers. In contrast, long range orderings are found not only within the layers, but between the layers as well at x = 0.25 and 0.33 to make 2a × 2a × 2c and \(\sqrt{3} a \times \sqrt{3} a \times 2c\) superlattices, respectively. These superlattices can be regarded as three-dimensional structures rather than two-dimensional ones. It is also noted that superlattice reflections can disappear due to the coexistence of domains with different phases in diffraction results.

https://doi.org/10.7566/JPSJ.89.074601

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Ordering of Intercalated Fe Atoms in FexTiS2 Structures Clarified Using Transmission Electron Microscopy

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Ordering of Intercalated Fe Atoms in Fe_xTiS₂ Structures Clarified Using Transmission Electron Microscopy