which stoichiometric defect in crystals increases the density of a solid?

Firstly let me clear it to you that, there are two types of stoichiometric defects, namely
  • Schottky defects : The absence of a cation or anion from the position which it is expected to occupy in the periodic arrangement of ions.
                      Since, the solid with a Schottky defect contains lesser of ions as compared to a perfect crystal, the density of the crystal exhibiting Schottky defect will be less as compared to that of the perfect crystal.
  • Frenkel defects : In this type, the ion of being in its expected location is found in one of the interstices.
                      The density of crystals exhibiting Frenkel defect remains unchanged as the ions are present in the interstitial sites without changing the volume of the substance.
               In interstitial defect vacancy is not created but an interstitial atom exists hence, density increases.

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schottky defect  defect in crystals increases the density of a solid.because the ratio between the anion and cation remain same as respected by the molecular formula 

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interstitial defects increases the density as cation gets trapped in the neighbouring sites thus increasing the density
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