Ultrahigh Thermal Conductivity of Cubic Boron Arsenide with an Unexpectedly Strong Temperature Dependence
arxiv(2024)
摘要
Materials with high thermal conductivity are needed to conduct heat away from
hot spots in power electronics and optoelectronic devices. Cubic boron arsenide
(c-BAs) has a high thermal conductivity due to its special phonon dispersion
relation. Previous experimental studies of c-BAs report a room-temperature
thermal conductivity between 1000 and 1300 watts per meter-kelvin. We
synthesized high purity c-BAs single crystals with room-temperature thermal
conductivity of 1500 watts per meter-kelvin. We observed its thermal
conductivity to be proportional to the inverse square of temperature between
300 and 600 kelvin, a stronger dependence than predicted by state-of-the-art
theory.
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