HW2-new - shown in the following figure PROBLEM 5 Pure iron...

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Intensity (A.U) A B C 1/2 1/2 y z 1/2 2/3 D ME311 MATERIALS ENGINEERING SPRING 2011 HOMEWORK #2 DUE DATE: February 11, before class PROBLEM 1: Draw a sketch, similar to Figure 2.10 in the textbook, showing the atomic arrangement and bonding you would expect to find in a molecule of oxygen (O 2 ) and in a molecule of ethylene (C 2 H 4 ). PROBLEM 2: What type of bonding would you expect for pure Calcium (Ca), pure Germanium (Ge), pure Barium Sulfide (BaS) and pure H 2 ? PROBLEM 3: In the Figure below the Auger spectrum of a particular element is shown. On the basis of the Table below, indicate which element can produce such a spectrum and describe schematically the electronic transitions taking place? Kinetic Energy (eV)
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Table: Binding energies of various elements for different energy levels. Al Cu C Si E K =1559 (1s) E K =8979 (1s) E K =284.2 (1s) E K =1839 (1s) E L1 =117.8 (2s) E L1 =1096.7 (2s) E L1 =10.5 (2s) E L1 =149 (2s) E L2 =72.9 (2p) E L2 =952.3 (2p) E L2 =4.6 (2p) E L2 =99.8 (2p) PROBLEM 4: Identify the rotational and mirror symmetries associated with the patterns
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Unformatted text preview: shown in the following figure PROBLEM 5: Pure iron goes through an allotropic transformation from bcc to fcc at approximately 910C. At the transformation temperature, the lattice parameter of bcc iron is 2.863 Å and the lattice parameter of fcc iron is 3.591 Å. Calculate the volume change associated with the transformation. Would you expect the material to expand or contract? Hint: Consider the fact that bcc iron has 2 atoms/unit cell, while fcc iron has 4 atoms/unit cell, and that the total number of atoms during the transformation does not change. PROBLEM 6: Determine the relationship between the atomic radius and the lattice parameter in the body centered cubic structure. PROBLEM 7: Determine the Miller indices for the directions A, B, C and D shown in the following cubic unit cell PROBLEM 8: For a cubic unit cell, sketch the following directions a) b) c)...
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HW2-new - shown in the following figure PROBLEM 5 Pure iron...

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