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Question

The number of tetrahedral voids in a FCC lattice is

A
4
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B
6
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C
8
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D
2
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Solution

The correct option is C 8
In FCC, tetrahedral voids are created at the conjuction of one atom at corner and three atoms at the face center. One body diagonal has 2 tetrahedral voids and there are total 4 body diagonals.
So, the number of tetrahedral voids in a FCC is 8.

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