## Fundamental Relations in Thermal Conductivity

According to kinetic gas theory, the lattice thermal conductivity above Debye temperature for an ideal lattice can be expressed by [12] к = 0.33 CvvL (35) where, Cv is the specific heat at constant volume, J/m3 K, v is the velocity of sound in solid, m/s, and L is the mean free path of scattered waves (the phonon wavelength), m.

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