LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

RO 31

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)

1. What is primitive cell ?
2. Draw a neat sketch for cubic Zinc sulfide crystal structure.
3. What is known as hydrothermal method.
4. What is the principle of working of scanning electron microscope.
5. How conductivity varies with temperature in
6. Conductors
7. Semiconductors
8. What is photoluminescence?
9. What are Ferrites ?
10. Define Neel temperature.
11. What is isotopic effect in super conductivity ?
12. What are Polarons ?

PART – B

Answer any Eight questions                     (8  ´ 5   = 40)

11. What are Miller Indices ? Explain how Miller indices is determined for a crystal plane.
12. With a neat diagram , explain the NaCl structure.
13. Discuss in detail about Bravais Lattices.
14. How is zone refining technique used to purify the material?
15. Explain the principle of working of thermogravimetric analysis.
16. Explain about point defects in crystalline solids.
17. Discuss in detail about the classification of ferroelectric crystals .
18. Distinguish between dia, para and ferromagnetic materials.
19. Explain the origin of ferromagnetic domains.
20. What is Meissner effect? What are Type – I &  Type – II super conductors.
21. Explain the principle, construction and working of high energy Lithium battery.
22. Discuss about the classification of liquid crystal and give their applications.

PART – C

Answer any four questions.                                 ( 4 ´ 10 = 40 )

23. What is hexagonal closed packed structure? Find the properties of hexagonal closed packed structure.
24. Discuss in detail about the growth of crystal from Czochraski method.
25. a). What are intrinsic and extrinsic semiconductors?

b). Derive an expression for intrinsic carrier concentration.

26. Write short notes on

a).Curie point and the exchange integral.

b).Temperature dependence of saturation magnetization.

c).Saturation magnetization at absolute zero.

27. Explain the occurrence of super conductivity based on Bardeen Cooper and Schrieffer theory.
28. Write short notes on a) Spinel
29. b) Perorakite structures
30. c) High temperature super conductors

 

 

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