I am studying solids states. So we studied different lattices of Ionic solids by introducting smaller Cations into VOIDS. Next topic is of defects. SO it is written Frankel defect arises when a smaller cation (or anion) shifts from its lattice site to Interstitial site.
Now something is wrong here. I have seen all the threads and topics, didnt find answer to it.
If we have already discussed all kind of Empty spaces as voids (octa, tetra etc), and have already filled them with cations while making ionic crystals, Now where these Interstitial spaces rises from?
Moreover, Cations are already in interstitial site, why they are even shifting to another interstitial site (which technically is already filled with cations, because we made ionic crystals by placing cations into interstitial sites.)