Electrical Resistivity of the Fe-Si-S Ternary System: Implications for Timing of Thermal Convection Shutdown in the Lunar Core

The electrical resistivity of Fe-14wt.%Si-3wt.%S was measured using a four-wire resistance technique in both solid and molten states at pressures up to 5 GPa and thermal conductivity was calculated via the Wiedemann-Franz Law from the electrical measurements. The results were used to estimate the adiabatic conductive heat flux of a molten Fe-14wt.%Si-3wt.%S lunar core and compared to a Fe-2-17wt.%Si lunar core from a previous study, which showed that thermal convection of either core composition shuts down within the duration of a high intensity paleomagnetic field.