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标题：Thermal conductivity of dense hcp iron: Direct measurements using laser heated diamond anvil cell
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作者：Pinku Saha ; Aritra Mazumder ; Goutam Dev Mukherjee 等
期刊名称：Geoscience Frontiers
印刷版ISSN：1674-9871
出版年度：2020
卷号：11
期号：5
页码：1755-1761
DOI：10.1016/j.gsf.2019.12.010
语种：English
出版社：Elsevier
摘要：AbstractThermal conductivity (k) of iron is measured up to about 134 GPa. The measurements are carried out using the single sided laser heated diamond anvil cell, where the power absorbed by aFemetal foil at hotspot is calculated using a novel thermodynamical method. Thermal conductivity offcc(γ) − Feincreases up to a pressure of about 46 GPa. We find thermal conductivity values in the range of 70–80 Wm−1K−1(with an uncertainty of 40%), almost constant with pressure, in thehcp(ε) phase ofFe. We attribute the pressure independentkabove 46 GPa to the strong electronic correlation effects driven by the electronic topological transition (ETT). We predict a value of thermal conductivity of ε -Feof about 40 ± 16 Wm−1K−1 at the outer core of Earth.Graphical abstractDisplay OmittedHighlights•Direct measurements of thermal conductivity in a laser-heated diamond cell are presented.•Thermal conductivity during melting and close to outer core condition of iron is carried out.•25–30% decrease of thermal conductivity is observed during melting at hotspot.•Moderate value of thermal conductivity supports an old core.
关键词：KeywordsenLaser heated diamond anvil cellThermal conductivityHigh pressure effectsGeodynamo