At 5 Å gaps, MgO [100] orientation conducts about 30% more heat across a vacuum gap than [110] and [210], an effect attributed to surface phonon modes.
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Crystal Orientation Dependence of Extreme Near-Field Heat Transfer between Polar Materials Governed by Surface Phonon Modes
At 5 Å gaps, MgO [100] orientation conducts about 30% more heat across a vacuum gap than [110] and [210], an effect attributed to surface phonon modes.