Temperature-invariant heat conductivity from compensating crystalline and glassy transport: from the Steinbach meteorite to furnace bricks
Michele Simoncelli,
Daniele Fournier,
Massimiliano Marangolo
et al.
Abstract:The thermal conductivities of crystals and glasses vary strongly and with opposite trends upon heating, decreasing in crystals and increasing in glasses. Here, we show—both with first-principles predictions based on the Wigner transport equation and with thermoreflectance experiments—that the dominant transport mechanisms of crystals (particle-like propagation) and glasses (wave-like tunnelling) can coexist and compensate in materials with crystalline bond order and nearly glassy bond geometry. We demonstrate … Show more
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