Fe- and C-self-diffusion in liquid Fe3C to 15 GPa

Details Fe- and C-self-diffusion in liquid Fe3C to 15 GPa Fe- and C-self-diffusion in liquid Fe3C to 15 GPa

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29u...2d&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 21, pp. 2-1, CiteID 2006, DOI 10.1029/2002GL015536

Physics

1

Geomagnetism And Paleomagnetism: Core Processes (8115), Physical Properties Of Rocks: Transport Properties, Planetology: Fluid Planets: Physical Properties Of Materials

Scientific paper

Iron- and C-self diffusion have been measured in Fe3C composition liquids at 8 and 15 GPa. Diffusivities fall within the range of values for molten metals and scale inversely to the atomic radius of each species. This supports models such as the Stokes-Einstein relation and the free volume model which relate transport properties to the atomic radius. Along the melting curve, diffusivity is predicted to be constant and we tentatively predict outer core diffusivities at the inner core boundary of 5 × 10-9 m2 s-1 and 7 × 10-9 m2 s-1 for iron and carbon, respectively. This would correspond to a viscosity of around 15 mPas.

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