First direct measurements reveal a conductivity drop in ferropericlase between 60-100 GPa at ~1700 K due to iron spin crossover, yielding a lower-mantle profile rising to ~10 W m^{-1} K^{-1} near the CMB.
In the lower mantle, extending from ~660 to 2900 km depth, heat is transferred both by thermal conduction and by convection of silicate and oxide materials
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Iron spin crossover in ferropericlase and its effect on lower-mantle thermal conductivity
First direct measurements reveal a conductivity drop in ferropericlase between 60-100 GPa at ~1700 K due to iron spin crossover, yielding a lower-mantle profile rising to ~10 W m^{-1} K^{-1} near the CMB.