2017年2月
Grain growth of ε-iron: Implications to grain size and its evolution in the Earth's inner core
Earth and Planetary Science Letters
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- 巻
- 459
- 号
- 開始ページ
- 238
- 終了ページ
- 243
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.epsl.2016.11.049
© 2016 Elsevier B.V. Knowledge of grain growth rate of ε-iron can put constraint on estimation of the grain size in the inner core. We determined grain growth rate of ε-iron at ∼55 GPa and 1200–1500 K by means of in-situ X-ray diffraction observation to be Gn−G0n=kt, where G (m) is the grain size at time t (s), G0(m) is the initial grain size, n is growth exponent (fixed to 2) and k is the growth constant expressed as k=k0exp(−H⁎/RT) with log k0(mn/s)=−5.8(±2.4) and activation enthalpy H⁎=221(±61) kJ/mol, and R is the gas constant and T is the absolute temperature. Extrapolation of the grain growth law of ε-iron to the inner core conditions suggests that the grain size in the inner core is in a range from several hundred meters to several kilometers, which is intermediate among the previous estimations, and hence the dominant deformation mechanism is considered to be Harper–Dorn creep rather than diffusion creep as pointed out by the previous work. This indicates the relatively uniform viscosity in the entire inner core.
- リンク情報
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- DOI
- https://doi.org/10.1016/j.epsl.2016.11.049
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000393006500022&DestApp=WOS_CPL
- URL
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85006298142&origin=inward
- URL
- http://orcid.org/0000-0002-5422-7396
- ID情報
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- DOI : 10.1016/j.epsl.2016.11.049
- ISSN : 0012-821X
- eISSN : 1385-013X
- ORCIDのPut Code : 58517898
- SCOPUS ID : 85006298142
- Web of Science ID : WOS:000393006500022