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Segregation of bare and protonated Mg vacancies to dislocation cores in MgO

Segregation of bare and protonated Mg vacancies to dislocation cores in MgO

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Authors

Richard Skelton, Andrew Walker 

Abstract

Water can be incorporated into the lattice of mantle minerals in the form of protons charge-balanced by the creation of cation vacancies. These protonated vacancies, when they interact with dislocations, increase strain rates by enhancing dislocation climb and, potentially, by reducing the Peierls barrier to glide. We use atomic scale simulations to investigate segregation of Mg vacancies to atomic sites within the core regions of dislocations in MgO. Energies are computed for bare and protonated Mg vacancies occupying atomic sites close to 1/2<110> screw dislocations, and 1/2<110>{100} and 1/2<110>{110} edge dislocations. T...  more

DOI

https://doi.org/10.31223/osf.io/d8bmy

Subjects

Earth Sciences, Mineral Physics, Physical Sciences and Mathematics

Keywords

dislocation, atomic-scale modeling, cation vacancy, MgO

Dates

Published: 2018-09-27 00:10

License

CC BY Attribution 4.0 International