Position of tetrahedral voids in fcc structure is:

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Solution

Two tetrahedral voids are present on each body diagonal of a fcc unit cell at a distance of $\frac{\sqrt{3} a}{4}$ from each corner. Totally, fcc unit cell will have 8 tetrahedral voids.

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Similar questions

In which of the following structures coordination number for cations and anions in the packed structure will be same ?

(a) $C l^{-}$ ions form fcc lattice and $N a^{+}$ ions occupy all octahedral voids of the unit cell

(b) $C a^{2 +}$ ions form fcc lattice and $F^{-}$ ions occupy all the eight tetrahedral voids of the unit cell

(d) $S^{2 -}$ ions form fcc lattice and $Z n^{2 +}$ ions go into alternate tetrahedral voids of the unit cell

What is the position of tetrahedral voids in FCC lattice?

F C C

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