M.Sc. DEGREE EXAMINATION, APRIL/MAY 2018.
Second Semester
Physics
Paper III MATERIALS SCIENCE

2 20723
Time 3 Hours Max. Marks 100
SECTION — A
(Short Answer Type)
Answer any FIVE of the questions. 8 40 Marks)
1. Explain the existence of ferromagnetic domains.
2. Explain the structure of Garnets.
3. Briefly discuss photoconduction in semiconductors.
4. Obtain Clausius-Mossotti relation.
5. Explain Gibb's phase rule.
6. Write a note on conducting polymers.
7. Discuss briefly the quantum size effect on the properties of nanomaterials.
8. Briefly write about carbon nano tubes.
SECTION — B
(Essay Answer Type)
Answer ALL questions. 15 60 Marks)
9. Explain Heisenberg criteria for ferromagnetism. Discuss Hysteresis behavior
of a ferromagnetic material.
Or
Briefly explain the Neel's theory of ferromagnetism. Give the basic principle
of magnetic bubble memories.

10. Explain in detail the principle of working, theory and characteristics of photo
diode.
Or
What is meant by ferroelectricity, explain the general properties and
classification of representative ferroelectric materials?
11. State and explain Humme-Rothery's rules. Discuss the phase diagram of
Pb-Sn alloy system.
Or
What is meant by translation and orientational order? Explain the orderdisorder
transformation in alloys.
12. What is meant by chemical potential and explain how chemical potential
varies as a function of surface curvature?
Or
Discuss in detail the synthesis of nanomaterials by Ion sputtering method.
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