First slide

Crystal lattices and unit cells

Question

In which pair most efficient packing in present?

Moderate

A

hcp and bcc
B

hcp and ccp
C

bcc and ccp
D

bcc and simple cubic cell

Solution

Packing efficiency is the percentage of total filled space by particles and it can be calculated as packing efficiency
$= \frac{volume occupied by four spheres in the unit cell}{total volume of unit cell} \times 100$
Since, packing efficiency for hcp or ccp is calculated to be 74% which maximum among all type of crystals.

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