Give reason : (a) Why is Frenkel defect found in AgCl but not in NaCl ? (b) What is the difference between phosphourus doped and Gallium doped semicoductors ?

Give reason : (a) Why is Frenkel defect found in AgCl but not in NaCl

1.	Give reason : (a) Why is Frenkel defect found in AgCl but not in NaCl ? (b) What is the difference between phosphourus doped and Gallium doped semicoductors ?
Answer» (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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Give reason : (a) Why is Frenkel defect found in AgCl but not in NaCl ? (b) What is the difference between phosphourus doped and Gallium doped semicoductors ?

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