LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

DB 29

M.Sc. DEGREE EXAMINATION – CHEMISTRY

THIRD SEMESTER – November 2008

    CH 3875 – MATERIAL SCIENCE

 

 

 

Date : 10-11-08                 Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART A

Answer all the questions.                                                                                  10 x 2 = 20

1. What are proper and improper axes?
2. Mention the steps involved in the determination of Miller Indices.
3. State and explain Bragg’s law of X- ray diffraction.
4. Write a note on work hardening and dynamic recovery.
5. Discuss the role of modulus as an essential parameter in design.
6. How is Na_xTaS₂ prepared?
7. What are n- and p-type semiconductors? Give an example for each.
8. Define Hall effect.
9. Draw the plot of variation of susceptibility with temperature for ferro and ferrimagnetic materials.
10. Give any two applications of shape memory alloys.

PART B

Answer any eight questions.                                                                                8 x 5 = 40

11. Mention the advantages of SEM over electron microscope. Discuss the working
    principle of SEM with neat diagram.
12. Describe the Bridgman-Stockberger melt method of crystal growth.
13. Discuss the disadvantages in using polymer materials and explain how the composite
    materials will be more useful in structural design?
14. Discuss in detail the TG method of thermal analysis with neat sketch.
15. Describe neutron diffraction method for crystal structure determination.
16. Write notes on mirror plane, glide plane and screw axis.
17. Write short notes on the following:
18. a) Second harmonic generators
19. b) optical mixing
20. Discuss the critical magnetic field and critical temperature of superconducting

compounds using Meissner effect.

 

19. Describe the structure of Na⁺ in β – alumina.
20. What are intercalation compounds? Explain with an example.
21. What are Cooper pairs? How is BCS theory helpful to describe the

superconductivity?

22. What are pyroelectric materials? Give any three applications.

PART C

Answer any four questions.                                                                              4 x 10 = 40

 

23. Outline the gelling mechanism and the experimental procedure to harvest crystals in a
    Gel by chemical reaction and solubility reduction techniques.
24. Describe the experimental set up to determine crystal structure by powder XRD
    method.
25. Explain different types of elastic behaviour and discuss the atomic model of elastic
    behaviour.
26. a) Why the ferromagnetic materials exhibit hysteresis? Explain.
27. b) How is water photoelectrocatalytically splitted using SrTiO₃ electrode? (5+5)
28. Describe the preparation and structure of one, two and three dimensional compounds
    with one example for each.
29. a) Explain any two uses of GMR materials.
30. b) What are soft and hard magnets? Give any five differences.    (5+5)

 

 

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