Question

Give reasons :A) Frenkel defects are not found in alkly metal halides.

B) schottky deffect lower the density of related solides

Answer 1

A) Frenkel defect is not found in pure alkali metal halides. This is because of the larger size of the cations of the alkali metals, due to the large size the cations cannot fit into the interstitial sites.

B) In schottky defect an equal number of cations and anions are missing from the interstitial sites and form vacancy or hole.And missing of thsese cations and anions leads to the lowering of density.