Thermal Conductivity in Solids

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

W/(m K) Room temperature Doping corresponding to a = 200 ^V/K

Material

Was this article helpful?

0 0
Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

Get My Free Ebook


Post a comment