1.

Explain the following terms with suitable example: a. Schottky defect b. Frenkel defect c. Interstitials d. F-centres

Answer» a. Schottky defect : It occurs when there is a vacancy of cation and anion sites in the lattice structure.
b. Frenkel defect : It occurs in an ionic crystal when an ion occupies an interstitial position rather than normal site.
c. Interstitials : Atoms of ions which occupy normally vacant interstitals (voids) in a crystal are called interstitials.
d. F-centres: The free electrons trapped in the site of anion vacancies are termed as F-centres.


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