The Ca^{2+} and F^{-} ions are located in a C | vedclass

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(A) In a $CaF_{2}$ (fluorite) structure,the $Ca^{2+}$ ions form a face-centered cubic $(FCC)$ lattice.Each unit cell of an $FCC$ lattice contains $4$

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Tetrahedral voids

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(A) In a $CaF_{2}$ (fluorite) structure,the $Ca^{2+}$ ions form a face-centered cubic $(FCC)$ lattice.Each unit cell of an $FCC$ lattice contains $4$ $Ca^{2+}$ ions.The number of tetrahedral voids in an $FCC$ unit cell is $2 	imes Z$,where $Z$ is the number of atoms per unit cell.Thus,there are $2 	imes 4 = 8$ tetrahedral voids.Since the stoichiometry of $CaF_{2}$ requires $2$ $F^{-}$ ions for every $Ca^{2+}$ ion,all $8$ tetrahedral voids are occupied by $F^{-}$ ions.Therefore,$F^{-}$ ions occupy all tetrahedral voids.

The $Ca^{2+}$ and $F^{-}$ ions are located in a $CaF_{2}$ crystal,respectively,at face-centered cubic lattice points and in:

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