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Posted Date: 06 Oct 2008 Posted By: Shanthi M Member Level: Diamond
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2008 Alagappa University M.Phil CRYSTAL GROWTH Question paper
DISTANCE EDUCATION
M.Phil. DEGREE EXAMINATION, MAY 2008.
Non-Semester Physics
CRYSTAL GROWTH
Time : Three hours Maximum : 100 marks
Answer any FIVE questions.(5 x 20 = 100)
1.What are primary nucleation and secondary nucleation? Discuss the formation of edge dislocation and screw dislocation during the crystal growth process. Explain with necessary diagrams.
2.Define solubility. Explain the method of measurement of supersaturation and discuss with Meir's solubility diagram.
3.Explain the mechanism of gel formation in silica gel media and discuss the method of crystal growth using U-tube. List the merits and demerits of gel growth.
4.What is meant by zone refining? Describe the method of zone refining process and explain how purification is achieved?
5.Describe the crystal growth process using crystal pulling technique. What are the requirements and restrictions in this method?
6.Explain the principles of flux growth technique. Discuss about choice of flux with an example. List the merits and demerits in flux growth.
7.Discuss the mechanism of chemical vapour deposition. Describe a method of growing single crystals by chemical vapour deposition technique. What is the uniqueness in this method?
8.Write notes on the following :
(a)Critical size in nucleation
(b)Molecular beam method.
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