Unformatted text preview: diamond denser than Si even though C is above Si in the periodic table and therefore has lower molecular weight? 5) (10 pts) GaAs is a semiconductor used in many telecommunication devices. It has the zinc blende structure. Draw the conventional unit cell for GaAs and give the coordinates of all the lattice points and the coordinates of all the Ga and As atoms. How many Ga atoms are there in the unit cell? How many As atoms are there in the unit cell? 6) (8 pts) Callister 3.30 (a)-(d) and Callister 3. 31 7) (16 pts) Callister 3. 40 8) (12 pts) Callister 3.41, 3.42 and 3.43 9) (10 pts) Picture below shows some Si wafers. Surfaces of these wafers are atomically smooth crystal planes. While you can not tell by looking at them, they are the (001) surface or the (111) surface. (There are others but these two are the most common.) Draw the atomic arrangement of these two surfaces and calculate their atomic density. The lattice constant a=0.5431 nm for Si....
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- Spring '08
- pts, memory chips, University of Minnesota Department of Chemical Engineering and Materials Science