Physics for Information Science: Unit I: Electrical Properties of Materials
Electron Theory of Metals
Electrons have similar behaviour in conductors, semiconductors, dielectric, magnetic and super conducting materials.
ELECTRON THEORY OF
METALS
Electrons
have similar behaviour in conductors, semiconductors, dielectric, magnetic and
super conducting materials. They also have same behaviour in all applications,
such as computer, television, radiography, electrical conduction etc... Thus,
The electron theory of metals explains the following concepts viz.
(i)
Structural, electrical and thermal properties of materials
(ii)
Elasticity, cohesive force and binding in solids
(iii)
Behaviour of conductors, semi conductors, insulators etc.
So
far three electron theories have been proposed.
(i) Classical free
electron theory: It is a macroscopic theory, proposed by
Drude and Lorentz in 1900. This theory explains the free electrons in lattice
and it obeys the laws of classical mechanics.
(ii) Quantum free
electron theory:
It
is a microscopic theory, proposed by sommerfeld in 1928. This theory is
explained with the concept that the electron moves in a constant potential and
it obeys the Quantum laws.
(iii) Brillouin zone
theory (or) Band theory: This theory is proposed by Bloch
in 1928. It is explained with the concept that the electron moves in a periodic
potential. This theory also explain the mechanism of semiconductivity, based on
the bands and hence called band theory.
Physics for Information Science: Unit I: Electrical Properties of Materials : Tag: Physics for Information Science : - Electron Theory of Metals
Physics for Information Science: Unit I: Electrical Properties of Materials
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Physics for Information Science
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