Question
The number of atoms per unit cell and the number of slip systems, respectively, for a face-centered cubic (FCC) crystal are
Options :
3,3
3,12
4,12
4,48
Answer :
4,12
Solution :
| Unit cell |
N |
CN | a/R |
APF | Number of
Slip
Systems |
| Simple
cubic |
1 | 6 | 2 | 0.52 | |
| Body
centered
cubic |
2 | 8 | 4/√3 | 0.68 | 48 |
| Face
centered
cubic |
4 | 12 | 4/√2 | 0.74 | 12 |
| Hexagonal
close
packed |
6 | 12 | a/R= 2 c/a=1.633 |
0.74 | 3 |
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