What is the difference in the stacking arrangement of close-packed planes in

(a) the HCP crystal structure and

(b) the FCC crystal structure? Although the FCC and HCP are both close-packed lattices with APF = 0.74, the structures differ in the three-dimensional stacking of their planes:

(c) the stacking order of HCP planes is ABAB… ;

(d) the FCC planes have an ABCABC… stacking sequence.

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Difference between HCP and FCP arises from two different possibilities of placing 3rd layer c fir... View the full answer