Single-crystal theta-phase tantalum's 125 W/m·K thermal conductivity at room temperature breaks Wiedemann-Franz limit for metals

https://www.eurekalert.org/news-releases/1124652

"heat transport dominated by phonons (atomic vibrations) rather than just electrons... 3-phonon scattering often causes collision/ interference with one another creating resistance to heat flow, suppressed with material's atomic arrangement enabling phonons to travel much further without interference... stiff chemical bonds/ lightweight nitrogen atoms contribute to high sound velocity further facilitating rapid heat dissipation... prevent overheating in power converters, RF devices, EV power systems"