Chemistry - Solid State Question with Solution | TestHub

As Frankel defect is observed in Ionic Compounds with low co-ordination number and in which size of cation and anion differ largely like ZnS etc. In case of Schottky’s defect as ions are missing so density decreases. NaCl(s) is insulator (no ion or electron to move), silicon is semiconductor, silver is conductor, quartz is piezo electric crystal.$\mathrm{F}\mathrm{e}{\mathrm{O}}_{0.98}$has non stoichiometric metal deficiency defect as$\mathrm{F}{\mathrm{e}}^{2+}$ion are missing so stoichiometry changes.