The pressure response of lattice thermal conduction in MgO periclase has been a matter of
interest for many decades to estimate the thermal conductivity prole of the lower mantle. Using the
pulsed light heating thermoreectance technique, we measured the lattice thermal diffusivity of MgO at
pressures up to 137 GPa at 300 K to determine its lattice thermal conductivity under deep lower mantle
conditions. Considering the temperature effect estimated by previous high-temperature measurements, we
calculated the lattice part of the thermal conductivity of MgO to be 17.9 ± 1.1 W/m/K at 135 GPa and 3600 K.
Additionally, we observed that the lattice conductivity of MgO has little dependence on its grain size under
core-mantle boundary conditions.
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