Discussion
Which one of the following statements regarding point defects in ionic solids is correct?
Answer: A
The correct statement is that Frenkel defects are dominant in those ionic solids where there is a considerable size difference between the cation and anion.
A Frenkel defect moves an ion, usually the smaller cation, from its site into an interstitial position. This is energetically easy only when that ion is much smaller than the other, so it fits into the interstices: AgCl and AgBr are the standard examples.
A Schottky defect is a pair of missing cation and anion, and it dominates when the ions are of similar size, as in NaCl and KCl, where neither ion fits into an interstice. So Schottky defects are not dominant where sizes differ, not dominant in all ionic solids, and the two defect types are not present in similar densities everywhere.
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