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Instability and transformation kinetics of the reconstructions in carburized W(1 1 0)

Title data

Kim, Jihyun ; Seo, Jikeun ; Rojas, Geoffrey ; Chen, X. ; Enders, Axel ; Kim, Jae-Sung:
Instability and transformation kinetics of the reconstructions in carburized W(1 1 0).
In: Applied Surface Science. Vol. 535 (January 2021) . - No. 147663.
ISSN 1873-5584
DOI: https://doi.org/10.1016/j.apsusc.2020.147663

Abstract in another language

We investigate the instability and transformation kinetics of the carbon-induced surface reconstructions on W(1 1 0) by the low temperature scanning tunneling microscopy. R (15 × 3) reconstruction, a moiré pattern of W2C(0 0 0 1) bi-layer on W(1 1 0), is the most carbon-rich reconstruction on the carburized W(1 1 0), which gradually transforms to the most carbon-poor R (15 × 12) reconstruction by repeated annealing at around 2070 K. In between, various reconstructions, albeit not globally ordered, develop. Notable is that all the observed reconstructions are invariably composed of only two kinds of building blocks, namely A-block and B-block. A-block is the surface unit cell of the R (15 × 3) reconstruction. During the transformation, the virtually carbon free B-block is created at the cost of two neighboring A-blocks by the annealing. The robustness of the block structure allows us to perform a coarse-grained kinetic Monte Carlo simulation of the transformation in terms of the creation and diffusion of B-blocks on the R (15 × 3) lattice that is initially entirely tiled by A-blocks. We find that the transformation kinetics is governed by both the anisotropic creation and diffusion of B-block that are attributed to the instability of A-block driven by the anisotropic compressive stress in it.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Moire pattern; Tungsten carbide; Transformation kinetics; STM; Kinetic Monte Carlo simulation; Nano patterning
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics XI - Functional Nanostructures
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics XI - Functional Nanostructures > Chair Experimental Physics XI - Functional Nanostructures - Univ.-Prof. Dr. Axel Enders
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 10 Feb 2021 08:06
Last Modified: 10 Feb 2021 08:06
URI: https://eref.uni-bayreuth.de/id/eprint/62839