. What is Anti-Fluorite Structure
This structure is shown by Li2O. Oxide ions are face centered cubic position and lithium ions are present in all the tetrahedral voids. There are four oxide ions and eight lithium ions per unit cell. As it can be seen, this unit cell is just the reverse of Fluorite structure, in the sense that, the positions of cations and anions is interchanged. Other substances which exist in this kind of a structure are Na2O, K2O and Rb2O.