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.There are $4$ $Ca^{2+}$ ions per unit cell.The num

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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.There are $4$ $Ca^{2+}$ ions per unit cell.The number of tetrahedral voids in an $FCC$ lattice is $2 	imes Z = 2 	imes 4 = 8$.To maintain electrical neutrality,$8$ $F^{-}$ ions occupy all $8$ tetrahedral voids.Thus,$Ca^{2+}$ ions are at the $FCC$ lattice points and $F^{-}$ ions are in 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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