Question

What happens when $AgCl$ is doped with $CdC{l}_2$? What is the name of this defect?

Answer 1

When $AgCl$ is doped with $Cd{Cl}_2$, two ${Ag}^{+}$ ions are replaced by one ${Cd}^{+2}$ ion. The ${Cd}^{+2}$ ion occupies the site of one of the ${Ag}^{+}$ ion and a cation vacancy are created at the site of the other ${Ag}^{+}$ ion.

The defect is known cation vacancy defect as a ${Ag}^{+}$ ion from the lattice is absent due to the presence of adjacent ${Cd}^{+2}$ ion.