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The accurate thermoelastic properties and thermal conductivity are crucial inunderstanding the thermal evolution of the Martian core. A fitting method basedon the ab initio calculated pressure-volume-temperature data is proposed in theformulation of the equation of state with high accuracy, by which the pressureand temperature dependent thermoelastic properties can be directly calculatedby definitions. The ab initio results show that the liquid Fe0.75S0.25 underMartian core condition is thoroughly in the ferromagnetic state, withoutexisting spin crossover. The liquid Fe0.75S0.25 in magnetic calculation owns alow thermal conductivity (21~23 W/m/K) when compared with non-magneticcalculation at the same state. Based on the Insight estimated and ab initiocalculated properties of the Martian core, the iron snow model is verified whenthe current temperature at the core-mantle boundary is below the core meltingtemperature, and the simply secular cooling model is verified on the contrary.

Thermoelastic properties and thermal evolution of the Martian core from ab initio calculated ferromagnetic Fe-S liquid