|
Sr. No. |
Properties |
Unit Cell |
||
|
SC |
BCC |
FCC |
||
|
1 |
No. of atoms per unit cell, n |
1 |
2 |
4 |
|
2 |
Atomic radius, r |
a/2 |
[a (square root of 3)] / 4 |
a / [ 2 (square root of 2)] |
|
3 |
Nearest neighbour distance, 2r |
a |
[a (square root of 3)] / 2 |
a / (square root of 2) |
|
4 |
Coordination number, CN |
6 |
8 |
12 |
|
5 |
Atomic packing fraction, APF |
(Pi / 6) = 0.52 |
[Pi (square root of 3)] / 8 = 0.68 |
Pi / [3 (square root of 2)] = 0.74 |
|
6 |
Void space |
48 % |
32 % |
26 % |
|
7 |
Density |
M / [n (a)3] |
2 M / [n (a)3] |
4 M / [n (a)3] |