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    A computer simulation study of the effect of pressure on Mg diffusion in forsterite

    115554_9194_A computational study of the effect of pressure on Mg.pdf (300.0Kb)
    Access Status
    Open access
    Authors
    Bejina, F.
    Blanchard, M.
    Wright, Kathleen
    Price, D.
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Bejina, Frederic and Blanchard, Marc and Wright, Kathleen and Price, David. 2009. A computer simulation study of the effect of pressure on Mg diffusion in forsterite. Physics of the Earth and Planetary Interiors 172: pp. 13-19.
    Source Title
    Physics of the Earth and Planetary Interiors
    DOI
    10.1016/j.pepi.2008.04.008
    ISSN
    00319201
    Faculty
    Department of Applied Chemistry
    Science and Engineering
    School
    Nanochemistry Research Institute
    Remarks

    Copyright © 2009 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/33239
    Collection
    • Curtin Research Publications
    Abstract

    Computer simulation techniques were used to investigate the effect of pressure on magnesium diffusionin forsterite between 0 and 10 GPa. We studied the diffusion path along the c crystallographic axis (we always refer to the Pbnm system) via a vacancy mechanism. Using a Mott-Littleton approach withinthe code GULP, we were able to precisely map the diffusion path of a Mg vacancy and we found theactivation energy, E = 3.97 eV at 0 GPa (with Ef = 3.35 eV for the formation energy and Em = 0.62 eV for the migration) and E = 4.46 eV at 10 GPa (Ef = 3.81 eV and Em = 0.65 eV). Preliminary results using the supercell technique gave the same saddle point coordinates and energies. This saddle point of the Mg vacancy diffusion found with GULP was then introduced in an ab initio code, confirming the values of the migration energy both at 0 and 10 GPa. We were therefore able to estimate the activation volume (V) to be around 5 cm3/mol and d(V)/dP = 0. The effect of pressure applies mostly on defect formation and little on migration.

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