Question

What type of stoichiometric defect is shown by:
i. ZnS

ii. KCl

iii. AgBr

Answer 1

i. ZnS shows Frenkel defect due to a large difference in size of Zn²⁺ ion and S^2- ion.
ii. KCl shows Schottky defects, as the size of K⁺ ion is almost similar to that of Cl^- ion.
iii. AgBr shows both Frenkel defect and Schottky defect.