Physics for Information Science: Unit I: Electrical Properties of Materials
Electron in Periodic Potential
In quantum free electron theory of metals the electrons were assumed to be moving in a region of constant potential and hence it moves freely about the crystal
ELECTRON
IN PERIODIC POTENTIAL
In
quantum free electron theory of metals the electrons were assumed to be moving
in a region of constant potential and hence it moves freely about the crystal.
But it fails to explain why some solids behaves as conductors, some as
insulators and some an semiconductors etc.
Therefore
instead of considering an electron to move in a constant potential, In Zone
theory of solids the electrons are assumed to move in a field of periodic
potential.
In
a metal piece, the positive ions are arranged in a regular and proper order,
therefore a periodic potential (i.e) the potential field which varies
periodically with the same period as the lattice, exists in the metal. Also the
potential is minimum near the centre of positive ions and is maximum between
the centres of ions as shown in Fig. 1.13.
Therefore
the potential energy of the electron near by the centre of positive ion is
maximum and will not be able to move freely, but the electrons which are above
these potential peaks are free to move inside the metal and hence they are
termed as free electrons.
Physics for Information Science: Unit I: Electrical Properties of Materials : Tag: : - Electron in Periodic Potential
Physics for Information Science: Unit I: Electrical Properties of Materials
Under Subject
Physics for Information Science
PH3256 2nd Semester CSE Dept | 2021 Regulation | 2nd Semester CSE Dept 2021 Regulation
Related Subjects
Professional English II
HS3251 2nd Semester 2021 Regulation | 2nd Semester Common to all Dept 2021 Regulation
Statistics and Numerical Methods
MA3251 2nd Semester 2021 Regulation M2 Engineering Mathematics 2 | 2nd Semester Common to all Dept 2021 Regulation
Engineering Graphics
GE3251 eg 2nd semester | 2021 Regulation | 2nd Semester Common to all Dept 2021 Regulation
Physics for Electrical Engineering
PH3202 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation
Basic Civil and Mechanical Engineering
BE3255 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation
Electric Circuit Analysis
EE3251 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation
Physics for Electronics Engineering
PH3254 - Physics II - 2nd Semester - ECE Department - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Electrical and Instrumentation Engineering
BE3254 - 2nd Semester - ECE Dept - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Circuit Analysis
EC3251 - 2nd Semester - ECE Dept - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Materials Science
PH3251 2nd semester Mechanical Dept | 2021 Regulation | 2nd Semester Mechanical Dept 2021 Regulation
Basic Electrical and Electronics Engineering
BE3251 2nd semester Mechanical Dept | 2021 Regulation | 2nd Semester Mechanical Dept 2021 Regulation
Physics for Civil Engineering
PH3201 2021 Regulation | 2nd Semester Civil Dept 2021 Regulation
Basic Electrical, Electronics and Instrumentation Engineering
BE3252 2021 Regulation | 2nd Semester Civil Dept 2021 Regulation
Physics for Information Science
PH3256 2nd Semester CSE Dept | 2021 Regulation | 2nd Semester CSE Dept 2021 Regulation
Basic Electrical and Electronics Engineering
BE3251 2nd Semester CSE Dept 2021 | Regulation | 2nd Semester CSE Dept 2021 Regulation
Programming in C
CS3251 2nd Semester CSE Dept 2021 | Regulation | 2nd Semester CSE Dept 2021 Regulation