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dc.contributor.authorBejina, F.
dc.contributor.authorBlanchard, M.
dc.contributor.authorWright, Kathleen
dc.contributor.authorPrice, D.
dc.identifier.citationBejina, 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.

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.

dc.titleA computer simulation study of the effect of pressure on Mg diffusion in forsterite
dc.typeJournal Article
dcterms.source.titlePhysics of the Earth and Planetary Interiors

Copyright © 2009 Elsevier B.V. All rights reserved

curtin.departmentNanochemistry Research Institute
curtin.accessStatusOpen access
curtin.facultyDepartment of Applied Chemistry
curtin.facultyScience and Engineering

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