LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – CHEMISTRY
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SIXTH SEMESTER – APRIL 2008
CH 6602 – CHEMISTRY OF MATERIALS
Date : 23/04/2008 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
PART – A
Answer all the questions. (10 ´2 = 20)
- What is primitive cell ?
- Draw a neat sketch for cubic Zinc sulfide crystal structure.
- What is known as hydrothermal method.
- What is the principle of working of scanning electron microscope.
- How conductivity varies with temperature in
- Conductors
- Semiconductors
- What is photoluminescence?
- What are Ferrites ?
- Define Neel temperature.
- What is isotopic effect in super conductivity ?
- What are Polarons ?
PART – B
Answer any Eight questions (8 ´ 5 = 40)
- What are Miller Indices ? Explain how Miller indices is determined for a crystal plane.
- With a neat diagram , explain the NaCl structure.
- Discuss in detail about Bravais Lattices.
- How is zone refining technique used to purify the material?
- Explain the principle of working of thermogravimetric analysis.
- Explain about point defects in crystalline solids.
- Discuss in detail about the classification of ferroelectric crystals .
- Distinguish between dia, para and ferromagnetic materials.
- Explain the origin of ferromagnetic domains.
- What is Meissner effect? What are Type – I & Type – II super conductors.
- Explain the principle, construction and working of high energy Lithium battery.
- Discuss about the classification of liquid crystal and give their applications.
PART – C
Answer any four questions. ( 4 ´ 10 = 40 )
- What is hexagonal closed packed structure? Find the properties of hexagonal closed packed structure.
- Discuss in detail about the growth of crystal from Czochraski method.
- a). What are intrinsic and extrinsic semiconductors?
b). Derive an expression for intrinsic carrier concentration.
- Write short notes on
a).Curie point and the exchange integral.
b).Temperature dependence of saturation magnetization.
c).Saturation magnetization at absolute zero.
- Explain the occurrence of super conductivity based on Bardeen Cooper and Schrieffer theory.
- Write short notes on a) Spinel
- b) Perorakite structures
- c) High temperature super conductors