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Earth's magnetic field is generated by the liquid outer core and sensitivelydepends on the thermal conductivity of the core. The dominant component of theEarth's core is Fe and Ni. However, current estimates on FeNi mixtures have notbeen previously tested at high pressures. In this paper, ab initio simulationswere first applied to calculations of the thermal and electrical conductivitiesof FeNi mixtures at Earth's outer core conditions. Compared with the resultsfor pure Fe, the addition of Ni decreases the thermal conductivity (12.30 W/m/Kon average) along the adiabatic curve in the outer core. Based on therestriction of the entropy production rate or Joule losses, the existence of Niprolongs the age of the inner core. The age of the inner core is 0.66 Ga withpure Fe and 0.67 Ga with an FeNi mixture when heat flow at the core-mantleboundary is 12 TW. In contrast, we observe that Ni decreases the thickness ofthermal stratification in the outer core by analyzing the effective temperaturegradient. After inner core solidification, the thickness of thermalstratification is 417.02 km with pure Fe and 320.12 km with an FeNi mixturewhen the cooling rate at the core-mantle boundary is 126 K/Ga.

Ab initio determination on the thermal evolution of the Earth's core