A first-principles study of the diffusion of atomic oxygen in nickel

Title
A first-principles study of the diffusion of atomic oxygen in nickel
Authors
남효온황일순이규환김지현
Keywords
First principles; Nickel; Modelling studies; Oxidation; Internal oxidation; Intergranular corrosion
Issue Date
2013-10
Publisher
Corrosion science
Citation
VOL 75, 248-255
Abstract
In this study, the coefficients of diffusion of oxygen in nickel-based alloys are determined by atomistically modeling the oxygen diffusion process using a vacancy-mediated diffusion model. Density functional theory is used to calculate the energy of the system. The activation barrier energy for the diffusion of atomic oxygen in nickel is quantified by determining the most favorable path, i.e., the minimum-energy path, for diffusion. Phonon analysis is performed using the direct force-constant method. The calculated pre-exponential factor for the lattice diffusion of oxygen in nickel is 5.45x10-7m2/s and the activation energy is 158.65kJ/mol.
URI
http://pubs.kist.re.kr/handle/201004/46936
ISSN
0010938X
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KIST Publication > Article
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