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• W2767748560 abstract "Diffusion of impurities along grain boundaries of compound materials is of high relevance for multiple practical applications. In this work, we perform a case study of Cu-impurity diffusion along the special coincident site lattice model Σ5(012)[100] GB in stoichiometric and off-stoichiometric TiN. The study includes a thorough investigation of the GB structure, formation of point defects and their interaction with a Cu-impurity at the interface as well as the evaluation of energy barriers for a few plausible impurity migration pathways along TiN grain boundaries. The results show that one of the most probable diffusion mechanisms (with an activation energy of 0.77 eV) is Cu-interstitial migration along a grain boundary channel. For a non-stoichiometric case when nitrogen vacancies can be present at GB, the results show that they can act as trapping centers for Cu atoms and increase the migration energy barrier to 1.2 eV. However, our results also indicate that at equilibrium conditions the effect of trapping may be reduced due to slightly unfavored segregation of N vacancies at TiN grain boundaries." @default.
• W2767748560 created "2017-11-17" @default.
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• W2767748560 date "2018-02-01" @default.
• W2767748560 modified "2023-09-27" @default.
• W2767748560 title "Point defects at the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si1.gif overflow=scroll><mml:mrow><mml:mtext>Σ</mml:mtext><mml:mn>5</mml:mn></mml:mrow></mml:math>(012)[100] grain boundary in TiN and the early stages of Cu diffusion: An ab initio study" @default.
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• W2767748560 doi "https://doi.org/10.1016/j.actamat.2017.11.005" @default.
• W2767748560 hasPublicationYear "2018" @default.
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