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Homework Help: Unit cell volume

  1. Nov 17, 2009 #1
    1. The problem statement, all variables and given/known data
    Q 2.

    (a) For the HCP crystal structure, show that the ideal c/a ratio is 1.633. (10%)

    (b) Hence, calculate the unit cell volume of cadmium with a HCP structure and atomic radius of
    0.1490 nm. Assume that the lattice period is equal to two times of the atomic radius. (5%)

    2. Relevant equations

    3. The attempt at a solution
    (a) part is okay.
    For (b) part, may i use the eqution Vc=6(R^2)C(3^1/2) without proving?
    or are there any other methods to find Vc by using the data c/a=1.633? (i know the eqution p=nA/(Vc)(Na) but seems not related to a=2R/1.6333)
  2. jcsd
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