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Question

In an atomic bcc, what fraction of edge (in percentage) is not covered by atoms?

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Solution

In body centre cubic unit cell atoms are present at corner + Body centre
Edge length = a

In bcc 3a=4rr=34×a
So; edge not covered =a2r
=a2×34×a
=a(132)

Fraction of edge is not covered by =a(132)a×100=13.4%

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