Thermal conductivity of dense hcp iron:Direct measurements using laser heated diamond anvil cell  

作　　者：Pinku Saha Aritra Mazumder Goutam Dev Mukherjee 

机构地区：[1]National Centre for High Pressure Studies,Department of Physical Sciences,Indian Institute of Science Education and Research Kolkata,Mohanpur Campus,Mohanpur,741246,Nadia,West Bengal,India

出　　处：《Geoscience Frontiers》2020年第5期1755-1761,共7页地学前缘（英文版）

基　　金：Ministry of Earth Sciences,Government of India for financial support under the project grant no.MoES/16/25/10-RDEAS;DST,INSPIRE program by Department of Science and Technology,Government of India for financial support。

摘　　要：Thermal 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 a Fe metal foil at hotspot is calculated using a novel thermodynamical method.Thermal conductivity of fee(γ)-Fe increases up to a pressure of about46 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 the hcp(e)phase of Fe.We attribute the pressure independent k above 46 GPa to the strong electronic correlation effects driven by the electronic topological transition(ETT).We predict a value of thermal conductivity ofε-Fe of about 40±16 Wm-1K-1 at the outer core of Earth.

关 键 词：Laser heated diamond anvil cell Thermal conductivity High pressure effects GEODYNAMO 

分 类 号：P575[天文地球—矿物学]