Ultrahigh thermal conductivity in isotope-enriched cubic boron nitride
Author(s)Chen, Ke; Song, Bai; Ravichandran, Navaneetha K.; Zheng, Qiye; Chen, Xi; Lee, Hwijong; Sun, Haoran; Li, Sheng; Udalamatta Gamage, Geethal Amila Gamage; Tian, Fei; Ding, Zhiwei; Song, Qichen; Rai, Akash; Wu, Hanlin; Koirala, Pawan; Schmidt, Aaron J; Watanabe, Kenji; Lv, Bing; Ren, Zhifeng; Shi, Li; Cahill, David G.; Taniguchi, Takashi; Broido, David; Chen, Gang; ... Show more Show less
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Materials with high thermal conductivity (κ) are of technological importance and fundamental interest. We grew cubic boron nitride (cBN) crystals with controlled abundance of boron isotopes and measured κ greater than 1600 watts per meter-kelvin at room temperature in samples with enriched [superscript 10]B or [superscript 11]B. In comparison, we found that the isotope enhancement of κ is considerably lower for boron phosphide and boron arsenide as the identical isotopic mass disorder becomes increasingly invisible to phonons. The ultrahigh κ in conjunction with its wide bandgap (6.2 electron volts) makes cBN a promising material for microelectronics thermal management, high-power electronics, and optoelectronics applications.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering
American Association for the Advancement of Science (AAAS)
Chen, Ke et al. "Ultrahigh thermal conductivity in isotope-enriched cubic boron nitride." Science 367, 6477 (January 2020): 555-559 © 2020 The Authors
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