The Solid State

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Explain the following with suitable examples:
Antifluorite structure 

Antifluorite structure: 
The antifluorite structure is the opposite arrangment with anion in FCC array with coordination number 8 and cation in the tetrahedral holes with coordination number 4. example of the antifluorite structure are K2O, LiO, Na2O and K2S.
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