Question

In crystal lattice formed by bcc unit

cell the void volume is

a. 68 % b. 74 %

c.32 % d. 26 %​

Answer 1

Answer:

Common sphere packings taken on by atomic systems are listed below with their corresponding packing fraction.

Simple cubic: 0.52 or 52%

Body-centered cubic (bcc): 0.68 or 68 %

Hexagonal close-packed (hcp): 0.74 or 74%

Now the percentage of void space = 100 - Packing percentage

For simple cubic = 100 - 52 = 48 %

For body centred cubic = 100 - 68 = 32 %

For Hexagonal close packed = 100 - 74 = 26 %.