LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – CHEMISTRY

GH 41

THIRD SEMESTER – APRIL 2008

CH 3875 – MATERIAL SCIENCE

 

 

 

Date : 30-04-08                  Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART A

Answer all the questions                                                                   10 ´ 2 = 20 marks

1. Illustrate proper and improper axes of symmetry.
2. Explain mirror plane with an example.
3. List the advantages of neutron diffraction.
4. Mention the applications of single crystals in science and technology.
5. Write a note on deformation by slip.
6. What are Cheveral phases? Give one example.
7. What is Josephson Effect?
8. ‘Li⁺ doped NiO shows a high conductivity’. Explain
9. What is piezoelectric effect?
10. What are tungsten bronzes?

PART B

Answer any EIGHT questions                                                         8 ´ 5 = 40 marks

1. Discuss the working of DTA instrument with a neat sketch and explain its
   applications.
2. Discuss the importance of crystal pulling techniques with the help of
   Czochralski method.
3. Explain the effect of grain size on the dislocation motion.
4. Give a brief introduction to crystal planes and directions. How are the crystal planes indexed?
5. With a neat diagram, explain different symmetry elements and the
   combination of symmetry elements.
6. Explain the role of modulus as one of the vital parameters in the design of
   structures.
7. Write a note on tetracyanoplatinate compounds.
8. Write a note on graphite intercalation compounds
9. Describe the Honda cell experiment to decompose water into its elements.
10. Write a note on metal oxide based semiconductors.
11. Discuss the shape memory alloys.
12. Discuss the behaviour of magnetoresistance materials.

 

PART C

Answer any FOUR questions                                                          4 ´ 10 = 40 marks

23. What are Baravis lattices? Discuss their characteristics supported by neat
    sketches and tables.

1. Outline the growth of single crystals by Gel technique and discuss the
   experimental procedure for 1) Chemical reaction method 2) Solubility
   reduction method and 3) Complex and Decomplex methods.
2. What is a rubbery material? Derive the expression for equation of state for
   the rubbery material.
3. Discuss the Li⁺ intercalated TiS₂ type of materials for battery applications.
4. Discuss the structure and superconductivity behaviour of high temperature superconductors.
5. Discuss the domain theory and hysteresis loop to explain the ferromagnetic behaviour.

 

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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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