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  • (a) What type of stoichiometric defect is shown by AgCl and why? (b) Calculate the efficiency of packing in case of a metal ceystal for simple cubic unit cell.    

(a) What type of stoichiometric defect is shown by AgCl and why?

(b) Calculate the efficiency of packing in case of a metal ceystal for simple cubic unit cell.

 

 

 

 
 
 
 
 

Answers (1)

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(a) The stiochiometric defect observed in AgCl crystal is Frenkel defcet since there is large difference in the size of Ag^{+} and Cl^{-}.

(b) Atoms per unit simple cubic unit cell is 1.

a = 2r

Packing efficiency = \frac{Vol. of a sphere}{Vol. of a unit cell}

                               = \frac{\frac{4}{3}\pi r^{3}}{a^{3}}\times 100 = \frac{\frac{4}{3}\pi r^{3}}{(2r)^{3}}\times 100 = \frac{\frac{4}{3}\pi r^{3}}{8r^{3}} \times 100 = \frac{\pi }{6}\times 100 = 52.4%

 

Posted by

Sumit Saini

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