Statistics – Computation
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pepi..172...13b&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 172, Issue 1-2, p. 13-19.
Statistics
Computation
3
Point Defects And Defect Clusters, Diffusion In Solids, Computational Modeling, Simulation, Geochemical Modeling, Plasticity, Diffusion, And Creep, High-Pressure Behavior
Scientific paper
Computer simulation techniques were used to investigate the effect of pressure on magnesium diffusion in 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 within the code GULP, we were able to precisely map the diffusion path of a Mg vacancy and we found the activation energy, E=3.97 eV at 0 GPa (with E=3.35 eV for the formation energy and E=0.62 eV for the migration) and E=4.46 eV at 10 GPa (E=3.81 eV and E=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 (ΔV) to be around 5 cm3/mol and d(ΔV)/dP≃0. The effect of pressure applies mostly on defect formation and little on migration.
Béjina Frédéric
Blanchard Marc
Price Geoffrey D.
Wright Kate
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