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b) Find the directional indices for the two vectors as shown in Figure Q3(b).
0.4 nm
0.3 nm
+x
-0.5 nm
Direction 2
Fig. Q3(b)
c) Calculate the atomic packing factor for the face-centered cubic (FCC) crystal structure.
Formula Sheet
nA
V.NA
dh
Direction 1
p=
hkl
nλ = 2d sin 0
hkl
V
APF = $
Ve
=
+y
a
√h² +k² +1²

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