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Fe- and C-self-diffusion in liquid Fe(3)c to 15 GPa

Dobson, DP; Wiedenbeck, M; (2002) Fe- and C-self-diffusion in liquid Fe(3)c to 15 GPa. Geophysical Research Letters , 29 (21) , Article 2006. 10.1029/2002GL015536. Green open access

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Abstract

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 5x10(-9) m(2) s(-1) and 7x10(-9) m(2) s(-1) for iron and carbon, respectively. This would correspond to a viscosity of around 15 mPas.

Type: Article
Title: Fe- and C-self-diffusion in liquid Fe(3)c to 15 GPa
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2002GL015536
Publisher version: http://dx.doi.org/10.1029/2002GL015536
Language: English
Additional information: Copyright 2002 by the American Geophysical Union
Keywords: Earth's core, Pressure, Viscosity, Temperature, Transport, Iron
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/140518
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