A cluster expansion model for rate constants of surface diffusion processes on Ag, Al, Cu, Ni, Pd and Pt(100) surfaces
DSpace at IIT Bombay
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Title |
A cluster expansion model for rate constants of surface diffusion processes on Ag, Al, Cu, Ni, Pd and Pt(100) surfaces
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Creator |
VERMA, S
REHMAN, T CHATTERJEE, A |
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Subject |
Atomic process
Activation barrier Nudged elastic band Cluster expansion Embedded atom method (EAM) Transition state theory KINETIC MONTE-CARLO TRANSITION-STATE THEORY THIN-FILM DEPOSITION EMBEDDED-ATOM-METHOD INFREQUENT EVENTS SELF-DIFFUSION MOLECULAR-DYNAMICS CHEMICAL-REACTIONS VAPOR-DEPOSITION SIMULATION |
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Description |
Rate constants of surface diffusion processes in metals often depend on the local atomic environment. Accurate models that describe this local environment dependence for specific material systems are not easily available in the literature despite the need for such information in kinetic models. In this work, we find the prefactor and activation barrier associated with adatom hop processes for a large number of local environments and use this information to systematically train cluster expansion (CE) models for Ag, Al, Cu, Ni, Pd and Pt. We demonstrate that although the local environments used for training is a small subset of all possible local environments, the CE model can predict the rate constants for many local environments that have not been used while training the model with reasonable accuracy. It is found that up to fourth nearest neighbor positions can be relevant to the activation barrier. Furthermore, many-body effects play an important role. We also find that the CE model depends on the direction of the hop. (C) 2013 Elsevier B.V. All rights reserved.
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Publisher |
ELSEVIER SCIENCE BV
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Date |
2014-10-14T12:59:29Z
2014-10-14T12:59:29Z 2013 |
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Type |
Article
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Identifier |
SURFACE SCIENCE, 613114-125
http://dx.doi.org/10.1016/j.susc.2013.03.022 http://dspace.library.iitb.ac.in/jspui/handle/100/14465 |
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Language |
en
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