1
Homework for Chapter 3. Total 100 points. Due on Thursday, 2/15 at the beginning of the
lecture.
1.
Why is there no base-centered cubic lattice in Table 3.2? (Use a sketch to answer). (5
points)
The base-centered cubic is equivalent to a simple tetragonal
Two adjacent base-centered unit
cubic cells
A simple tetragonal unit cell
2.
Calculate the APF of 0.68 for the bcc metal structure. (5 points)
For bbc metal,
, where a is the lattice parameter and r is the radius of the
metal.
3.
Calculate the APF of 0.74 for fcc metals. (5 points)
For fcc metal,
, where a is the lattice parameter and r is the radius of
the metal.

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