LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – CHEMISTRY

AD 25

THIRD SEMESTER – NOV 2006

CH 3875 – MATERIAL SCIENCE

 

 

Date & Time : 06-11-2006/9.00-12.00   Dept. No.                                                       Max. : 100 Marks

 

 

PART – A

Answer all the questions                                  (10 x 2 = 20)

 

1. What are “glide planes”?
2. Give the expression for Brinell Hardness number.
3. Mention few applications of single crystals.
4. List the thermodynamical properties that can be measured using TG/DSC methods.
5. Write a note on “electron charge density maps”.
6. What is Meissner effect?
7. What is Hall effect?
8. What is breakdown diode? What are its uses?
9. What is Josephson’s effect?
10. What are ferrites? What is the role of this compound in super conductivity?

 

 

PART – B

 

Answer any eight questions                                 (8 x 5 = 40)

 

11. Outline the principle, instrumentation and applications of thermogravimetric method.
12. State Brags’s law. Discuss the powder method of X-ray diffraction.
13. With neat sketch explain the Bridgman-Stockbarger method of crystal growth from melt.
14. What are Miller indices? Illustrate their formation in different planes of a cube.
15. Discuss the role of modulus as an essential parameter in the structural design.
16. Describe the slow evaporation technique of growing crystals with Manson jar apparatus.
17. How are cooper pairs formed? Explain BCS theory of superconductivity.
18. Describe the role of TaS₂ in high temperature superconductivity.
19. Describe domain theory to account for the Hysteresis behaviours of magnetic materials.
20. Write short notes on a) LED b) Photo voltaic cell.
21. Explain qualitatively how a p-n junction functions as a rectifier.
22. Distinguish between Zenner breakdown and avalanche breakdown.

 

 

 

PART – C

 

Answer any four questions                                                 (4 x 10 = 40)

 

23. Describe (i) Chemical reaction (ii) Chemical reduction (iii) Complex decomplexion and (iv)    solubility reduction methods of growing single crystals by gel.
24. Outline the essential features of rubber like elasticity. Obtain the equation of            state for           the rubbering material.
25. What is meant by symmetry operation? Describe point group and space group        symmetry        elements with necessary diagram.

26. Explain the working of a p-n junction. Discuss forward and reverse biasing of p-n junction.
27. Describe the behaviour and properties of conductors, insulators and semiconductors on the    basis of band theory.
28. Write short notes on a) 1-2-3 oxides b) Chevral phases c) hard and soft magnetic materials.

 

 

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