Oxygen ionic conduction in MgSiO3 perovskite

Details Oxygen ionic conduction in MgSiO3 perovskite Oxygen ionic conduction in MgSiO3 perovskite

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pepi..139...55d&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 139, Issue 1-2, p. 55-64.

Physics

10

Scientific paper

The electrical conductivity of Na-doped MgSiO3 perovskites has been measured at 24GPa and temperatures between 1300 and 2200K. At temperatures below about 1800K extrinsic oxygen ionic conduction dominates, with an activation energy of 1.4+/-0.2eV and a pre-exponential which is proportional to the Na-content. At higher temperatures, a different conduction mechanism, which is insensitive to Na-content, dominates with ΔH=3.6+/-0.2eV and logσ0=9.4+/-0.4Sm-1. This is tentatively attributed to intrinsic electronic conduction. The present results suggest that there may be a region at the top of the earth's lower mantle in which the electrical conductivity is particularly sensitive to compositional effects. Deeper still, the earth's electrical conductivity will be more sensitive to temperature effects.

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