Question
What type of crystal defect is produced when sodium chloride is doped with $\mathrm{MgCl}_2$ ?
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Answer
A cation vacancy is formed, so impurity defect is produced. A substitutional solid solution is formed (because $2 \mathrm{Na}^{+}$ ions are replaced by one $\mathrm{Mg}^{2+}$ ion at the lattice site).
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