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Give reason : (a) Why is Frenkel defec...

Give reason :
(a) Why is Frenkel defect found in AgCl ?
(b) What is the difference between silicon doped with phosphorus and doped with gallium semi-conductors ?

Text Solution

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(a) Frenkel defect is found in htose ionic compounds in which idifference in the size of cation and anion is large. This is so in case of AgCl but not in case of NaCl. Due to small size of silver cations `( Ag^(+))` they can fit into the interesitial sites but `Na^(+)` ions cannot fit not the interstitial sites.
(b) Silicon doped posphorus gives n-type whereas silicon doped with gallium forms p-type semiconductors .
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