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  • (a)    Atoms of element B form hcp lattice and those of the element A occupy  of octahed

(a)    Atoms of element B form hcp lattice and those of the element A occupy \frac{2}{3}^{\textup{rd}} of octahedral voids. What is the formula of the compound formed by the elements A and B?

(b)    What type of stoichiometric defect is shown by ZnS and why?

 

 

 

 
 
 
 
 

Answers (1)

(a)    Total atoms in hcp = 6

        octahedral voids = no. of atoms

                                       = 6

        B = 6

         A = \frac{2}{3}\times 6

               = 4

\underset{4}{A} \underset{6}{B} \Rightarrow A_4B_6

formula of compound A_2B_3

(b)    ZnS shows Frenkel defect because Zn and S have large difference in the size of ions.

 

Posted by

Sumit Saini

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