New material cools 3× better than copper
Researchers reported a material that conducts heat roughly three times better than copper, presented for uses like AI and quantum‑device cooling. (x.com) The post framed the advance around thermal management for high‑power electronics rather than consumer appliance use. (x.com)
Heat moves through solids the way traffic moves through a city: the fewer collisions, the faster it clears. A UCLA-led team reported a metal-like crystal, theta-phase tantalum nitride, that carries heat at about 1,100 watts per meter-kelvin, versus roughly 400 for copper. (science.org) The study was published in *Science* in January 2026, led by Yongjie Hu of the University of California, Los Angeles, with measurements made at Argonne National Laboratory’s Advanced Photon Source. Argonne said the material is the highest-thermal-conductivity metal yet measured. (science.org) (aps.anl.gov) Copper has long been the standard heat spreader in electronics, and UCLA said it makes up about 30% of commercial thermal-management materials. The new measurements put theta-phase tantalum nitride at nearly three times the thermal conductivity of copper and silver, the usual benchmark metals. (samueli.ucla.edu) In chips, “thermal conductivity” is just how quickly a material can pull heat away from a hot spot. That matters as artificial-intelligence accelerators, power electronics and quantum hardware pack more energy into smaller areas, where excess heat cuts speed, efficiency and reliability. (aps.anl.gov) (nature.com) Most metals hit a ceiling because heat carriers keep scattering off one another. The *Science* paper said theta-phase tantalum nitride avoids more of those collisions through a combination of weak electron-phonon coupling and a phonon spectrum that suppresses phonon-phonon scattering. (science.org) That atomic structure had been predicted before anyone made the right crystal cleanly enough to test it. A 2021 *Physical Review Letters* paper projected room-temperature conductivity near 995 watts per meter-kelvin in one crystal direction, and a 2023 *Applied Physics Letters* paper reported synthesizing theta-phase tantalum nitride under 7.8 gigapascals and 1,750 kelvin. (aps.org) (aip.org) The catch is manufacturing. UCLA’s technology summary says prior efforts to stabilize this phase needed extreme pressure and temperature, and polycrystalline versions lose performance when grain boundaries, defects and mixed phases interrupt heat flow. (ucla.technologypublisher.com) That means the result is a materials benchmark first, not a drop-in replacement for the copper block in a laptop. The near-term target is places where a small gain in heat removal changes the economics or performance of dense hardware, including advanced chips, data centers and quantum systems. (aps.anl.gov) (samueli.ucla.edu) For more than a century, copper and silver were treated as the practical upper limit for heat-carrying metals. This result does not put theta-phase tantalum nitride into mass production yet, but it does move that limit from assumption to open engineering problem. (samueli.ucla.edu)
