PH3251 Materials Science Question Papers
Download PH3251 Materials Science Question Papers. In this Notes Very Useful for First Year Second Semester Students.
“PH3251 Materials Science Question Papers”
“Materials Science Question Papers”
“PH3251 Question Papers”
Subject Info:
| Semester | Second Semester |
| Department | Mechanical Engineering |
| Year | First Year |
| Regulation | R 2021 |
| Subject Code / Name | PH3251 Materials Science |
| Content | Question Papers |
Syllabus:
PH3251 Materials Science
UNIT I CRYSTALLOGRAPHY
Crystal structures: BCC, FCC and HCP – directions and planes – linear and planar densities – crystal imperfections- edge and screw dislocations – grain and twin boundaries – Burgers vector and elastic strain energy- Slip systems, plastic deformation of materials – Polymorphism – phase changes – nucleation and growth – homogeneous and heterogeneous nucleation.
UNIT II ELECTRICAL AND MAGNETIC PROPERTIES OF MATERIALS
Classical free electron theory – Expression for electrical conductivity – Thermal conductivity, expression – Quantum free electron theory: Tunnelling – degenerate states – Fermi- Dirac statistics – Density of energy states – Electron in periodic potential – Energy bands in solids – tight binding approximation – Electron effective mass – concept of hole. Magnetic materials: Dia, para and ferromagnetic effects – Para magnetism in the conduction electrons in metals – exchange interaction and ferromagnetism – quantum interference devices – GMR devices.
UNIT III SEMICONDUCTORS AND TRANSPORT PHYSICS
Intrinsic Semiconductors – Energy band diagram – direct and indirect band gap semiconductors – Carrier concentration in intrinsic semiconductors – extrinsic semiconductors – Carrier concentration in N-type & P-type semiconductors – Variation of carrier concentration with temperature – Carrier transport in Semiconductors: Drift, mobility and diffusion – Hall effect and devices – Ohmic contacts – Schottky diode.
UNIT IV OPTICAL PROPERTIES OF MATERIALS
Classification of optical materials – Optical processes in semiconductors: optical absorption and emission, charge injection and recombination, optical absorption, loss and gain. Optical processes in quantum wells – Optoelectronic devices: light detectors and solar cells – light emitting diode – laser diode – optical processes in organic semiconductor devices –excitonic state – Electro-optics and nonlinear optics: Modulators and switching devices – plasmonics.
UNIT V NANOELECTRONIC DEVICES
Quantum confinement – Quantum structures – quantum wells, wires and dots – Zener-Bloch oscillations – Resonant tunneling – quantum interference effects – mesoscopic structures – Single electron phenomena – Single electron Transistor. Semiconductor photonic structures – 1D, 2D and 3D photonic crystal. Active and passive optoelectronic devices – photo processes – spintronics – carbon nanotubes: Properties and applications.