High-quality synthetic boron arsenide achieves thermal conductivity exceeding 2,100 W/mK at room temperature, potentially higher than diamond

https://www.eurekalert.org/news-releases/1102815

"improved synthesis techniques/ purifying raw arsenic to produce cleaner crystals... also effective semiconductor, potential silicon replacement in electronics... easier and cheaper to manufacture than diamond, which was previously considered the best thermal conductor, and possesses properties—like a wider band gap and much higher carrier mobility—that could lead to significantly better thermal management in devices such as cell phones, high-powered electronics, and data centers"