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Electrical Resistivities and Temperature Coefficients of Metals and Alloys
| Content Provider | Scilit |
|---|---|
| Author | Pollock, Daniel D. |
| Copyright Year | 2020 |
| Description | Normal metals and some of their alloys are good thermal and electrical conductors because their nearly free electrons only partially fill their bands or Brillouin zones. These electrons have relatively high drift velocities and, for elemental metals, have relatively long mean free paths in the lattice (Section 5.7.3). Simultaneously, the ions oscillate about their equilibrium positions in the lattices and constitute a phonon gas (Sections 3.11 and 3.11.4). These phonons interact with the motions of electrons and limit their mean free paths and relaxation times. Such electron-phonon interactions, or “collisions”, are known as scatterings. The number of phonons increases with increasing temperature and more effective scattering of the electrons occurs; this constitutes resistance to the flow of electrons. In terms of Equation 5-64, $L(E_{F}$) decreases, $v(E_{F}$) changes negligibly (Equation l-38a and Section 5.4), therefore, the relaxation time, $τ(E_{F}$), decreases with increasing temperature. This diminishes the electrical conductivity and increases its reciprocal, the electrical resistivity, as a function of temperature. Book Name: PHYSICAL PROPERTIES of MATERIALS for ENGINEERS 2ND EDITION |
| Related Links | https://content.taylorfrancis.com/books/download?dac=C2006-0-08450-6&isbn=9781003068082&doi=10.1201/9781003068082-6&format=pdf |
| Ending Page | 228 |
| Page Count | 38 |
| Starting Page | 191 |
| DOI | 10.1201/9781003068082-6 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2020-10-07 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Physical Properties of Materials for Engineers 2nd Edition Temperature Function Equation Lattice Electrical Phonon Scatterings Constitute |
| Content Type | Text |
| Resource Type | Chapter |
