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ming2194
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Homework Statement
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%)
Homework Equations
The Attempt at a Solution
(a) part is okay.
For (b) part, may i use the equation 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 equation p=nA/(Vc)(Na) but seems not related to a=2R/1.6333)