Open problems in transport physics of ultrahigh-thermal conductivity materials
Source abstract
Abstract
Recent searches of high-lattice thermal conductivity (κl) materials have explored size-dependent non-diffusive phonon transport in low-dimensional systems and pursued compound crystals with light and heavy elements. As a paradigm shift from past high-κlcriteria that emphasize simple crystals made of light elements, the latter has led to ultrahigh-κlsemiconducting boron arsenide (BAs) where a large phonon gap in such compounds limits three-phonon scattering and makes four-phonon processes unusually important. Frequent four-phonon scattering and consequently convergent κlhave also been calculated in graphene because of numerous low-frequency flexural phonons, raising a question whether high-order lattice anharmonicity is sufficient to prevent graphene and carbon nanotubes from breaking the κlrecords of diamond and graphite due to weakened phonon hydrodynamics. Open problems have also remained on four-phonon processes in BAs, electron–phonon coupling effects in semiconductors and semimetals including θ-tantalum nitride with predicted high({upkappa }l), and quantized lattice thermal conductance in nanowires and nanotubes.Graphical abstract
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Thermal properties of materials · Composite Material Mechanics · Numerical methods in engineering
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (100+)
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