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CHE350_Fall2011_Quiz1 - Soln

CHE350_Fall2011_Quiz1 - Soln - L hrr'i rf/OA1&S Y 0 a/16/1...

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ChE 350 Fa112011 a /16/1) «Practice" Quiz 1 I 1. On the unit cells shown below, sketch the positions of the atoms in a (a) face centered cubic (fee), (b) body-centered cubic (bee) and (c) simple cubit unit cell L hrr'i rf/OA1- &S 0 Y Name: So luI;'on (a) (b) (c) ~ 011\ (()r~er o~ O'~ (~'1er &{{«(e // x/ ·.:; ~11. (fJ rl1 er X./ J,,. d Q =- i., {~f~' 2. On the unit cell below, sketch the atoms in a diamond cubic lattice (draw the bonds to the nearest neighbors to help with clarity): z " 0 /w / ./ 0 0 y ~/ 0 /7 ••• y z / /" .. ' •• y / V z x/ z f/eerox 1 0 (J~ OK do ( ) wk,...}o r oJo~~ I , ~ "'- - -- "'- y 4 .., <'"V J 3 ~ --- "-/ Lt Lf '1... ~ 11.. ...... Lf;:;'1 .., .... , 1 I ~ 4 't Lf y x 3. Determine both the (hid) and (hkil) indices for the planes shown in the following hexagonal unit cells: c, z z z :L) ( 2) ( = ( ~~k:{ l =-{"'-+/d ;I :"! a3 ~3 ;, al al (b) (I o 0) (c) ( I I I ) ( 1 0 tltT 0) (T J 0 , ) 1 I, •..• ,
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ChE 350 Fall 2011 "Practice" Quiz 1 4. A newly-discovered material has an fee crystal structure. It has a density of20 g/crrr' and a 5. (A) Convert the i) [331] and ii) [120] lattice directions into the four-index Miller-Bravais scheme for hexagonal unit cells:' l' .:c (I 11.1 i)[T" 2 0 ii) @ I - I 0] (B) Sketch (and label) the [331] and [112] lattice directions in the hexagonal unit cell: ~
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