Ultrahigh thermal conductivity in isotope-enriched cubic boron nitride.
basic_science · Level V
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- Record sourced from PubMed, PMID 31919128.
- Also identified by 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 greater than 1600 watts per meter-kelvin at room temperature in samples with enriched <sup>10</sup>B or <sup>11</sup>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.