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Voids

In an antiflu...

Question

In an antifluorite structure, cations occupy:

A

octahedral voids

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B

centre of cube

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C

tetrahedral voids

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D

corners of cube

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Solution

The correct option is B tetrahedral voids
In Antipluorite structure ( $A_{2} X$ type ) there is FCC packing of anions and all tetrahedral voids are filled by cations. The coordination numbers of cations and anions are respectively $A$ and $B$ .

Example: $N a_{2} O, K_{2} O, L i_{2} O$

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