In solids, heat propagates via two different mechanisms:
1. It is conducted by the same carriers that transport electric charges. The corresponding thermal conductivity, XC, is called carrier conductivity. It is related to the electric conductivity by the Wiedemann-Franz-Lorenz law.
2. It is also conducted by thermal vibrations of the crystalline lattice (i.e., by phonons) propagating along the material. This conductivity is called the lattice conductivity, XL.
The first mechanism is dominant in metals as they have an abundance of carriers and have relatively soft lattices. However, the opposite
Table 5.3 Thermal Conductivities Some Semiconductors
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