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Schottky defect lowers the density of io...

Schottky defect lowers the density of ionic crystals while Frenkel defect does not. Discuss.

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In Schottky defect, certain cations and anions are missing from the crystal lattice. Therefore, the density of the crystal decreases. However, in Frenkel defect, the ions do not leave the lattice but they simply change their positions from lattice points to the interstitial spaces. As a result, the density of the crystal remains unchanged.
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