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Paper detail

Grain Boundary Motion on Curved Substrate

Grain boundary (GB) kinetics is important for many applications in 2d materials and metal thin films. To study how the substrate shape affects GB mobility and kinetics, we develop a kinetic Monte Carlo (kMC) simulation method and an analytical model for GBs on the curved substrate by combining disconnection theory and by Foppl von Karman equations. Using sinusoidal MoS2 as an example, we can increase its GB mobility more than 50 times by changing substrate shape amplitudes and periods. We find that amplitude change GB mobility exponentially while wave vector change GB mobility linearly. The sinusoidal GB kinetic shape has wave vector twice as substrate and amplitude proportional to substrate squared amplitude.

preprint2022arXivOpen access
Kongtao Chen
cond-mat.mtrl-sci
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Kongtao Chen

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