Validation of the Wiedemann-Franz Law in Solid and Molten Tungsten above 2000 K through Thermal Conductivity Measurements via Steady-State Temperature Differential Radiometry
Milena Milich (University of Virginia)
Hunter B. Schonfeld (University of Virginia)
Konstantinos Boboridis (European Commission - Joint Research Centre)
Davide Robba (European Commission - Joint Research Centre)
Luka Vlahovic (European Commission - Joint Research Centre)
Rudy J.M. Konings (External organisation, European Commission - Joint Research Centre)
Jeffrey L. Braun (Laser Thermal Analysis Inc., Charlottesville)
John T. Gaskins (Laser Thermal Analysis Inc., Charlottesville)
Niraj Bhatt (University of Rhode Island, Kingston)
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Abstract
We measure the thermal conductivity of solid and molten tungsten using steady state temperature differential radiometry. We demonstrate that the thermal conductivity can be well described by application of Wiedemann-Franz law to electrical resistivity data, thus suggesting the validity of Wiedemann-Franz law to capture the electronic thermal conductivity of metals in their molten phase. We further support this conclusion using ab initio molecular dynamics simulations with a machine-learned potential. Our results show that at these high temperatures, the vibrational contribution to thermal conductivity is negligible compared to the electronic component.