Topography and Atomic Structure Investigations Of (100) Cleavage Surface of In4Se3 Layered Crystals
| Authors | P.V. Galiy , T.M. Nenchuk , I.R. Yarovets |
| Affiliations | Ivan Franko Lviv National University, 50, Dragomanov Str., 79005 Lviv, Ukraine |
| Е-mail | galiy@electronics.lnu.edu.ua |
| Issue | Volume 6, Year 2014, Number 2 |
| Dates | Received 19 May 2014; revised manuscript received 04 June 2014; published online 20 June 2014 |
| Citation | P.V. Galiy, T.M. Nenchuk, I.R. Yarovets, J. Nano- Electron. Phys. 6 No 2, 02029 (2014) |
| DOI | |
| PACS Number(s) | 61.46._w, 68.37.Ef, 68.37.Ps, 68.47.Fg, 61.05.Jh |
| Keywords | Layered crystals, Interlayer cleavage surfaces, Topography (2) , Atomic structure, Scanning tunneling microscopy, Atomic force microscopy (9) , Low energy electron diffraction. |
| Annotation | The atomic microstructure and crystallography of (100) surfaces of In4Se3 layered crystals obtained by cleavage in situ were studied by the methods of scanning tunneling and atomic force microscopies (STM, AFM) and low energy electron diffraction (LEED) for reflection. The obtained results indicate the existence of periodic corrugated structures on the cleavage surface. It is shown that (100) In4Se3 cleavage surface is structurally stable and doesn't undergo reconstruction in a wide temperature range of 77-295 K. The anisotropy of thermal expansion along the main crystallography directions in the (100) In4Se3 cleavage plane has been shown. The evaluation of the two-dimensional lattice constant in the cleavage (100) surface plane of orthorhombic In4Se3 layered crystal was done. The calculated values of the lattice constants in consequence of LEED study, such as b 11,475 Å and c 3,734 Å, coincide well with those obtained by the AFM and STM (b 13-14 Å and c 4 Å), and correlate, within the errors limits, with the corresponding values obtained by X-ray diffraction (b 12,308(1) Å and c 4,0810(5) Å). Besides, the obtained results of cleavage surface structure studies show the correctness of filtering application concerning topography images and indicate the adequacy of the model used for calculations of the cleavage (100) surfaces lattice constants of In4Se3 in accordance with the LEED results. The influence of the LEED experimental module structure on the results has been considered. |
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List of References English version of article |
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