Question
How does Frenkel defect arise?
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Answer
- Frenkel defect : This defect arises when an ion of an ionic compound is missing from its regular site and occupies interstitial vacant position between lattice points.
- Cations have smaller size than anions, hence generally cations occupy the interstitial sites.
- This creates a vacancy defect at its original position and interstitial defect at new position.
- Frenkel defect is regarded as the combination of interstitial defect and vacancy defect.
- This defect arises in ionic compounds with a large difference between the sizes of cation and anion.
- The ionic compounds must have ions with low coordination number.
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