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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