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Question

The packing efficiency of the face centered cubic (fcc), body centered cubic (bcc) and simple primitive cubic (pc) lattices follows the order:

A
fcc>bcc>pc
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B
bcc>fcc>pc
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C
pc>bcc>fcc
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D
bcc>pc>fcc
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Solution

The correct option is A fcc>bcc>pc

Face centred cubic (fcc) lattice has a packing efficiency of 74%.

Body centred cubic (bcc) lattice has a packing efficiency of 68%.

Simple/ Primitive cubic (pc) lattice has a packing efficiency of 52.4%.

Hence, the correct order is fcc > bcc > pc.


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