Unformatted text preview: 2. The surface of a Si wafer is a (100) plane (a) Sketch the placement of Si atoms on the surface of the wafer? (b) Determine the number of atoms per cm 2 at the surface of the wafer. (c) Repeat parts (a) and this time taking the surface of the Si wafer to be a (110) plane. (d) Repeat parts (b) and this time taking the surface of the Si wafer to be a (110) plane. 3. Treating atoms as rigid spheres with radii equal to onehalf the distance between nearest neighbors, show that the ratio of the volume occupied by the atoms to the total available volume in the various crystal structure is (a) π /6 or 52% for the simple cubic lattice. (b) 3 π /8 or 68% for the body centered cubic lattice. (c) 2 π /6 or 74% for the face centered cubic lattice. (d) 3 π /16 or 34% for the diamond lattice....
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 Spring '08
 Staff
 Cubic crystal system, Diamond cubic, Crystal system, Atomic packing factor, simple cubic lattice

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