TY - JOUR
T1 - A flash heating method for measuring thermal conductivity at high pressure and temperature: application to Pt
AU - Mcwilliams, Stewart
AU - Konopkova, Z.
AU - Goncharov, Alexander.f.
PY - 2015/6
Y1 - 2015/6
N2 - The transport properties of matter at high pressure and temperature are critical components in planetary interior models, yet are challenging to measure or predict at relevant conditions. Using a novel flash-heating method for in-situ high-temperature and high-pressure thermal conductivity measurement, we study the transport properties of platinum to 55 GPa and 2300 K. Experimental data reveal a simple high-pressure and high-temperature behavior of the thermal conductivity that can be described as linear in both pressure and temperature. The corresponding electrical resistivity evaluated through the Wiedemann-Franz-Lorenz law is nearly constant along the melting curve, experimentally confirming the prediction of Stacey for an ideal metal. This study together with prior first-principles predictions of transport properties in Al and Fe at extreme conditions suggests a broad applicability of Stacey’s law to diverse metals, supporting a limit on the thermal conductivity of iron at the conditions of Earth’s outer core of 90 W/mK or less.
AB - The transport properties of matter at high pressure and temperature are critical components in planetary interior models, yet are challenging to measure or predict at relevant conditions. Using a novel flash-heating method for in-situ high-temperature and high-pressure thermal conductivity measurement, we study the transport properties of platinum to 55 GPa and 2300 K. Experimental data reveal a simple high-pressure and high-temperature behavior of the thermal conductivity that can be described as linear in both pressure and temperature. The corresponding electrical resistivity evaluated through the Wiedemann-Franz-Lorenz law is nearly constant along the melting curve, experimentally confirming the prediction of Stacey for an ideal metal. This study together with prior first-principles predictions of transport properties in Al and Fe at extreme conditions suggests a broad applicability of Stacey’s law to diverse metals, supporting a limit on the thermal conductivity of iron at the conditions of Earth’s outer core of 90 W/mK or less.
U2 - 10.1016/j.pepi.2015.06.002
DO - 10.1016/j.pepi.2015.06.002
M3 - Article
SN - 0031-9201
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
ER -