Unusual high thermal conductivity in boron arsenide bulk crystals

Conventional theory predicts that ultrahigh lattice thermal conductivity can only occur in crystals composed of strongly-bonded light elements, and that it is limited by anharmonic three-phonon processes. We report experimental evidence that is a departure from these long-held criteria. We measured a local room-temperature thermal conductivity exceeding 1000 W m–1 K–1 and an average bulk value reaching 900 W m–1 K–1 in bulk b…
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