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Every atom or ion that forms an fcc unit...

Every atom or ion that forms an fcc unit cell is surrounded by

A

six octahedral holes and eight tetrahedral holes

B

eight octahedral holes and six tetrahedral holes

C

six octahedral holes and six tetrahedral holes

D

eight octahedral holes and four tetrahedral holes

Text Solution

Verified by Experts

Look at corner atom of FCC unit cell. A corner atom can support 8 unit cell. In each cube, at a distance of ` (sqrt(3))/(4)` a from corner atoms, there is a tetrahedral void, it implies each atom is surrounded by eight tetrahedral voids. At the centre of edge there is an octahedral void. Each corner can support six edges and hence it is surrounded by six octahedral voids.
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