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In the fluorite structure if the radius ...

In the fluorite structure if the radius ratio is `(sqrt(3/(2))-1)` how many ions does each cation touch?

A

4 anions

B

12 cations

C

8 anions

D

No cations

Text Solution

Verified by Experts

`(r_(-))/(r_(+))= sqrt((3)/(2))-1 = 0.225 `
Hence it is the limiting case where FCC of cation is not distorted. So, no of cation surrounding the particular cation = 12. But at the same time 8 anions (present in tetrahedral voids) touch the particular cation.
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