In fcc structure, the number of tetrahedral voids present along the edges of the fcc unit cell is:

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Solution

From the figure, it can be seen that there is no tetrahedral void along the edge in the fcc unit cell.

Tetrahedral voids are present at the centres of the mini cubes (formed if we divide the cube into 8 equal parts).

Octahedral voids are present on the edges of the cube as well as the centre of the cube.

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What is the number of tetrahedral voids in FCC Unit cell?

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

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