期刊
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
卷 247, 期 -, 页码 27-35出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.pepi.2015.03.006
关键词
Fe-O liquid alloy; Outer core; Viscosity; Diffusivity
资金
- X-ray Free Electron Laser Priority Strategy Program of the Ministry of Education, Culture, Sports, Science & Technology in Japan (MEXT)
- JSPS [26800237, 26287105]
- Grants-in-Aid for Scientific Research [26287137, 26287105, 15H05826, 26800237, 13F03023, 15H05834] Funding Source: KAKEN
The self-diffusion and tracer diffusion coefficients and viscosity of non-magnetic liquid Fe-0 alloys were determined at 100-350 GPa and 4000-8000 K on the basis of the ab initio molecular dynamics simulation method. Those of pure liquid iron are found to be consistent with the results of former studies. We confirmed that the self-diffusivity of Fe monotonically increases with increasing oxygen fraction. Meanwhile, the viscosity monotonically decreases with increasing oxygen fraction. On the other hand, the depth dependence of diffusivities and viscosity in the outer core are not great along the geotherm because pressure and temperature conversely affect the transport coefficients. The calculated diffusivity suggests that an O-rich stratified layer with a thickness of 70 km could be produced at the uppermost layer of the outer core if the layer was created from the diffusion of O from the mantle. (C) 2015 Elsevier B.V. All rights reserved.
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