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Ultrahigh thermal conductivity in isotope-enriched cubic boron nitride

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Science  09 Jan 2020:
eaaz6149
DOI: 10.1126/science.aaz6149

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Abstract

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 over 1600 Wm−1 K−1 at room temperature in samples with enriched 10B or 11B. In comparison, we found 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 eV) makes cBN a promising material for microelectronics thermal management, high-power electronics, and optoelectronics applications.

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