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

作者：Pinku Saha,Aritra Mazumder,Goutam Dev Mukherjee

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.

发文机构：National Centre for High Pressure Studies

关键词：LaserheateddiamondanvilcellThermalconductivityHighpressureeffectsGEODYNAMO

分类号： TG1[金属学及工艺—金属学]