Compute the atomic packing factor for the diamond cubic crystal structure (Figure 12.15). Assume that bonding atoms

Question:

Compute the atomic packing factor for the diamond cubic crystal structure (Figure 12.15). Assume that bonding atoms touch one another, that the angle between adjacent bonds is 109.5°, and that each atom internal to the unit cell is positioned a/4 of the distance away from the two nearest cell faces (a is the unit cell edgelength).