1. Conducting Materials 14 hours
1.1
Resistivity
and factors affecting the resistivity of conducting materials.
1.2
The
electron gas model of a metal, electrical conduction, mobility, Fermi function,
Fermi energy, Effect of temperature on electrical conductivity of metals,
contact potential.
1.3
Super
conductivity: effect of magnetic field on super conductor and application of
super conductor.
1.4
Electrical
conducting materials: – suitability of copper, aluminum, tungsten, carbon &
graphite, iron and steel as electrical conducting materials.
1.5
Special
purpose materials – Electrical contact materials, alloy materials (e.g.
constantan, German Silver, manganin,
nichrome), thermo couple.
2. Insulating Materials 14 hours
2.1
Effect
of a dielectric on the behavior of a capacitor.
2.2
Polarisation,
different kinds of polarisabilities, dielectric constant, dielectric losses,
significance of the loss tangent.
2.3
Frequency
dependence of polarisabilities.
2.4
Break
down in dielectric materials.
2.5
Important
requirements of good insulating materials (e.g. mica, porcelain, polythene, PVC
(polyvinyl chloride), asbestos, cotton, glass, transformer oil and polymers),
their properties and applications.
2.6
Ferro
electric and piezoelectric materials, their properties and applications.
3. Magnetic Materials 14 hours
3.1
Introduction,
classification of magnetic materials into diamagnetic, paramagnetic,
ferromagnetic and ferrimagnetic materials.
3.2
Origin
of ferromagnetism, ferromagnetic domains, magnetization curve, hysteresis loop,
factors affecting permeability and hysteresis loss.
3.3
Ferrimagnetism:
ferrites and its uses in high frequency devices.
3.4
Common
magnetic materials (e.g. Iron and silicon iron alloys, Nickel-Iron Alloys,
permanent magnet materials), their properties and uses.
4. Electrons in Solids – an Introduction to
Band Theory 4 hours
4.1
Introduction,
Origin of formation of energy band.
4.2
Allowed / disallowed energy bands in solids, band
gap, effective mass of an electron.
4.3
Classification of materials into conductors,
semiconductors and insulators.
5. Semi Conducting Materials and Devices 14 hours
5.1
Crystal
structure of semi conductors (Ge & Si).
5.2
Types
of semiconductors and conduction processes.
5.3
Carrier
concentration and position of the Fermi level in intrinsic and extrinsic
semiconductors (p-type e n-type).
5.4
Effect
of temperature and impurities on the conductivity of a semiconductor.
5.5
Doping
and diffusion, Einstein relation.
5.6
Hall
effect – (Hall voltage, Hall coefficient, Hall mobility and Hall angle) and its
applications.
5.7
p-n
junction, junction diodes, junction transistors (npn and pnp) and their
characteristics.
5.8
Metal-semiconductor
junctions-ohmic and rectifying, MOSFET, MOS capacitor.
Text books
I. C.S. Indulkar and S. Thiruvengadam, “ An
Introduction to Electrical Engineering Materials” S. Chand and Company, New
Delhi (Reprint 2003).
Reference
Books