Self-diffusion of oxygen and silicon in MgSiO3 perovskite

Details Self-diffusion of oxygen and silicon in MgSiO3 perovskite Self-diffusion of oxygen and silicon in MgSiO3 perovskite

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008e%26psl.270..125d&link_type=abstract

Earth and Planetary Science Letters, Volume 270, Issue 1-2, p. 125-129.

Physics

9

Scientific paper

We present results of simultaneous measurements of self-diffusion of oxygen and silicon in magnesium silicate perovskite. Oxygen diffusion is ~ 2 orders of magnitude faster than Si self-diffusion and Fe Mg interdiffusion in perovskite, with D0 = 9.16 × 10- 4 (+ 0.16 / - 9.2 × 10- 6) m2/s and Q = 501 ± 80 kJ/mol at 25 GPa. Despite this high O diffusivity, however, the electrical conductivity of the lower mantle will be dominated by electronic conduction and the present-day core is likely to be out of redox equilibrium with the mantle.

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