globalchange  > 气候减缓与适应
DOI: 10.1002/2013GL057930
论文题名:
Electrical and thermal transport properties of iron and iron-silicon alloy at high pressure
作者: Seagle C.T.; Cottrell E.; Fei Y.; Hummer D.R.; Prakapenka V.B.
刊名: Geophysical Research Letters
ISSN: 0094-8445
EISSN: 1944-8176
出版年: 2013
卷: 40, 期:20
起始页码: 5377
结束页码: 5381
语种: 英语
英文关键词: Earth's core ; iron ; iron-silicon ; resistivity
Scopus关键词: Core-mantle boundary ; Earth's core ; High thermal conductivity ; iron-silicon ; Linear temperature dependence ; Room temperature ; Theoretical study ; Thermal transport properties ; Chemical elements ; Electric conductivity ; Heat transfer ; High pressure engineering ; Iron ; Iron alloys ; Silicon alloys ; Transport properties ; Thermal conductivity ; alloy ; convection ; electrical resistivity ; geodynamo ; heat transfer ; high pressure ; iron ; power law ; shock wave ; temperature ; thermal conductivity
英文摘要: The efficiency of heat transfer by conduction in the Earth's core controls the dynamics of convection and limits the power available for the geodynamo. We have measured the room temperature electrical resistivity of iron and iron-silicon alloy to 60 GPa and present a new model of the resistivity at high pressures and temperatures relevant to the Earth's core. The model is compared with available shock wave data and theoretical studies. For a power law and linear temperature dependence of electrical resistivity, the calculated thermal conductivity at the core-mantle boundary is ∼67-145 W/m/K for pure Fe and ∼41-60 W/m/K for Fe-9 wt % Si. Impurities in the core have a strong effect on the transport properties of iron that could significantly impact core thermal models. The models describing the data indicate higher thermal conductivity at core pressure than previously suggested, requiring additional energy sources in the past to operate the geodynamo. Keypoints Pure iron has a high thermal conductivity at core conditions Light elements can significantly reduce the thermal conductivity of iron ©2013. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84886911321&doi=10.1002%2f2013GL057930&partnerID=40&md5=e5cbd3cc054b2fb8c99ded3b93be3cfc
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5709
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作者单位: National Museum of Natural History, Smithsonian Institution, Washington, DC, United States

Recommended Citation:
Seagle C.T.,Cottrell E.,Fei Y.,et al. Electrical and thermal transport properties of iron and iron-silicon alloy at high pressure[J]. Geophysical Research Letters,2013-01-01,40(20).
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