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Unformatted text preview: NATIONAL INSTITUTE OF TECHNOLOGY ROURKELA B.Tech. Autumn Mid-Semester Examination, 2012 Session: 201 2-13 Sub: (CR- 219) : introduction to Ceramic W Full Marks: 30 Duration of Examination: 2.00 hrs ROURKELA Answer all questions Write down the general characteristics of ceramic materials. What is 2+1 = 3 dead burnt magnesite? Discuss the crystal structure of the following ionically bonded 2+2=4 ceramic material i Wurtzite structure ii Perovskite structure Name one crystalline and one amorphous form of silica. Discuss the conversion and inversion of silica giving all the transformation temperatures and the phases formed in each case. What is sillimanite group of minerals? How they differ towards mullite formation? Draw the stress vs Strain diagram of a ceramic material. What is brittle fracture? BaTi03 is a ceramic material that exhibit both ferroelectricity and piezoelectricity — Explain the reason What is the difference between anti-ferromagnetism and ferrimagnetisms? Estimate the number of bohr magnetons per unit cell in manganoferrite [MnFezO4]g Mn = 25, Fe = 26, O = 8 Write Short note on: i Silicate structure ii Fluxing material iii China clay iv Sea water magnesia ...
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