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We measure the thermal conductivity of solid and molten tungsten using SteadyState Temperature Differential Radiometry. We demonstrate that the thermalconductivity can be well described by application of Wiedemann-Franz Law toelectrical resistivity data, thus suggesting the validity of Wiedemann-FranzLaw to capture the electronic thermal conductivity of metals in their moltenphase. We further support this conclusion using ab initio molecular dynamicssimulations with a machine-learned potential. Our results show that at thesehigh temperatures, the vibrational contribution to thermal conductivity isnegligible compared to the electronic component.

Validation of the Wiedemann-Franz Law in solid and molten tungsten above  2000 K through thermal conductivity measurements via steady state temperature  differential radiometry