Schottky Defect



Which of these CaCl2 or NaCl will produce Schottky Defect when added to AgCl and why?

I know NaCl is answer (may be) but what is the reason for it?


Ca is divalent cation and silver is univalent cation.

When CaCl2 is mixed with AgCl, then one Ca^+2 ion will replace two Ag^+ ions. It will create a vacancy in place of one Ag^+ ion and so there will be Schottkey defect in the compound.