Which point defects lowers the density of a crystal?
density of crystal is lowered in shottky defect because.in shottky defect equal no of cations & anions are missing from the lattice,so the electrical neutrality is mantained and as no of cations n anions are missing so mass will deacrease we know that
so density is directly proportional to mass,so due to deacrease in mass sdensity will also deacrease.
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In ionic-solids VACANCY DEFECT lowers the density of the crystal. in this defect some of the lattice site are vacant, which results in decrease in density of crystal. this defect also develop when crystals are heated.
in non ionic-solids SCHOTTKY DEFECT lowers the density of crystal. this defect is basically a vacancy defect. in this defect number of missing cations and anions are equal, in order to maintain electrical neutrality.