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(A) In an $FCC$ unit cell,there are $8$ tetrahedral voids located at the corners of the smaller cube formed by joining the centers of these voids.Sinc

Vedclass · Accepted Answer

$1$ Tetrahedral void,$1$ Octahedral void

Vedclass · Answer

(A) In an $FCC$ unit cell,there are $8$ tetrahedral voids located at the corners of the smaller cube formed by joining the centers of these voids.Since each of these $8$ tetrahedral voids is shared by $8$ such cubes,the effective number of tetrahedral voids within the new cube is $8 	imes \frac{1}{8} = 1$.Additionally,there is an octahedral void located at the body center of the original $FCC$ unit cell,which also corresponds to the body center of the new smaller cube.Therefore,the new cube contains $1$ effective tetrahedral void and $1$ octahedral void.

In an $FCC$ unit cell,a cube is formed by joining the centers of all the tetrahedral voids to generate a new cube. Then the new cube would contain effective voids as

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