Experimental study of thermal conductivity at high pressures [electronic resource] : Implications for the deep Earth’s interior

Published:: Washington, D.C. : United States. National Nuclear Security Administration, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:: pages 11-16 : digital, PDF file
Additional Creators:: United States. National Nuclear Security Administration and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Lattice thermal conductivity of ferropericlase and radiative thermal conductivity of iron bearing magnesium silicate perovskite (bridgmanite) – the major mineral of Earth’s lower mantle– has been measured at room temperature up to 30 and 46 GPa, respectively, using time domain thermoreflectance and optical spectroscopy techniques in diamond anvil cells. The results provide new constraints for the pressure dependencies of the thermal conductivities of Fe bearing minerals. The lattice thermal conductivity of ferropericlase (Mg0.9Fe0.1)O is 5.7(6) W/(m*K) at ambient conditions, which is almost 10 times smaller than that of pure MgO; however, it increases with pressure much faster (6.1(7)%/GPa vs 3.6%/GPa). The radiative conductivity of Mg0.94Fe0.06SiO3 bridgmanite single crystal agrees with previously determined values at ambient pressure; it is almost pressure-independent in the investigated pressure range. Furthermore, our results confirm the reduced radiative conductivity scenario for the Earth’s lower mantle, while the assessment of the heat flow through the core-mantle boundary still requires in situ measurements at the relevant pressure-temperature conditions.

Report Numbers:

E 1.99:1335450

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Published through SciTech Connect.
02/24/2015.
": S0031920115000199"
Physics of the Earth and Planetary Interiors 247 C ISSN 0031-9201 AM
Alexander F. Goncharov; Sergey S. Lobanov; Xiaojing Tan; Gregory T. Hohensee; David G. Cahill; Jung -Fu Lin; Sylvia -Monique Thomas; Takuo Okuchi; Naotaka Tomioka.
Carnegie Institution of Washington, Washington, D.C. (United States)

Funding Information:

NA0002006

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