sample problems for exam I 2007

Sample problems for - II-1ø Ȫ I 2007 2008 ȪV ¶Iø I V V V V ª 2È Iø ê D ƒL E ƒ 1PL õœ 10 V II A

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Unformatted text preview: II-1ø Ȫ I ¶ 2007- 2008 ȪV ¶Iø I V V V V ª 2È Iø¶ ê@ D ƒL E ƒ ë 1PL õœ+ 10 V II - A- ┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆┆ • r III IV V 0 100V I. Please indicate if each of the following statement is true (T) or false (F) in the parenthesis provided after the statement. (10 points) 1. The atomic packing in FCC and HCP crystals are the same because they have exactly the same atomic packing factor. ( ) II. Fill in the blanks in the following statement. (10 points) 1. If the properties of the material are the same in all directions, such a material is 1 called a(an) ________________ material. 2. In BCC, if the atomic radius is R, then the cube edge length of its unit cell a is _________. III. Choose the best answer for the following questions or complete the sentences from A, B, C, or D given below. (20 points) 1. Which metallic crystal structure has the smallest APF? _________ A. BCC 2. B. FCC C. HCP D. SC Li, Na, K, etc, are examples of ___________ metals. A. alkali B. inert C. halogen D. rare earth IV. Please finish the following problems for crystallographic directions and planes. (20 points) 1. Please determine the indices for the directions shown in the following cubic unit cell. Please show your steps. (6 points) 2 z A b B b 1/2 C b y b x 2. Please determine the indices for the planes shown in the following cubic unit cell. Please show your steps. (6 points) 3. Please determine the indices for the directions shown in the following hexagonal unit cell. Please show your steps. (4 points) 4. Please determine the indices for the planes shown in the following hexagonal unit cell. Please show your steps. (4 points) V. Please solve the following problems with detailed steps. (40 points) 1. Calculate the radius of a vanadium atom, given that V has a BCC crystal structure, a density of 5.96 g/cm3, and an atomic weight of 50.9 g/mol. (8 points) 2. Sketch the atomic packing of the (111) plane for the BCC crystal structure. (5 points) 3. On the basis of ionic charge and ionic radii, predict the crystal structure for the following materials: (a) CsI, (b) NiO. Justify your answers. (6 points) 3 4 ...
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This note was uploaded on 07/27/2010 for the course EAS 213 taught by Professor Dj during the Spring '10 term at Panola.

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