How would you account for the following?(i) Frenkel defects are not found in alkali metal halides.(ii) Schottky defects lower the density of related solids.(iii) Impurity doped silicon is a semiconductor.

How would you account for the following?(i) Frenkel defects are not fo

1.	How would you account for the following?(i) Frenkel defects are not found in alkali metal halides.(ii) Schottky defects lower the density of related solids.(iii) Impurity doped silicon is a semiconductor.
Answer» (i) This is because alkali metal ions have larger size which cannot fit into interstitial sites. (ii) As the number of ions decreases as a result of Schottky defect, the mass decreases whereas the volume remains the same. (iii) This is due to additional electron or creation of hole on dopping with impurity. Creation of hole causes p-type semiconductor and creation of electron causes n-type semiconductor.

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How would you account for the following?(i) Frenkel defects are not found in alkali metal halides.(ii) Schottky defects lower the density of related solids.(iii) Impurity doped silicon is a semiconductor.

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