Frenkel Unit Cell question? Why doesn\'t a Frenkel defect change the density of

Question

Frenkel Unit Cell question? Why doesn't a Frenkel defect change the density of the crystal? What does it mean that "each vacancy is accompanied by an interstitial"? Wouldn't removing the one atom (in a Frenkel defect) alter the entire desnity of the crystal?

3. Does the presence of Frenkel defects change the density of a crystal? Explain. Not by a significant amount, because each vacancy is accompanied by an interstitial. In large numbers, such defects could cause a small bulging of the crystal and lower its density.

Explanation / Answer

A Frenkel defect is a type of point defect in a crystal lattice. The defect forms when an atom or smaller ion (usually cation) leaves its place in the lattice, creating a vacancy, and becomes an interstitial by lodging in a nearby location."Each vacancy is accompanied by an interstitial" means that as one vacancy is created when atom leaves its place , an interstitial is formed as that atom moves to interstitial site.This defect does not have any impact on the density of the solid as it involves only the migration of the ions within the crystal, thus preserving both the volume as well as mass.Removing atom will affect density as mass decreases with removal of atom.

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