Q2(a) [4 Marks) Explain the methods you would use to identify both directions and planes in crystals. Describe, using di

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Q2 A 4 Marks Explain The Methods You Would Use To Identify Both Directions And Planes In Crystals Describe Using Di 1 (36.55 KiB) Viewed 43 times

Q2(a) [4 Marks) Explain the methods you would use to identify both directions and planes in crystals. Describe, using diagrams, the steps involved in labelling the (111) plane in a crystal. Q 2(b) [8 Marks) An experiment on a monatomic crystal shows diffraction in the first order at 32.2 degrees for the (111) planes in a BCC crystal. Where would this peak occur if the crystal were FCC and had the same atomic radius? Q2(c) [8 Marks) Lead (Pb) is a metal that has a density of 11000 kg/m2 and an atomic mass of 207 amu. There are 4 valence electrons per Pb atom. (0) What is the density of valence electrons (number per cm) in Pb? [3] (ii) Given that the Fermi wavevector is KF = (3172n) 13 calculate the Fermi energy and Fermi velocity and Fermi temperature of Lead, assuming the Free Electron Model. (5)