The ZnS zinc blende structure is cubic. The unit cell may be described as a face-centered sulfide ion sublattice with zinc ions in the centers of alternating minicubes made by partitioning the main cube into 8 equal parts (as shown in fig.)
= 0.225
Text Solution
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(a,b,d)
As each Zn 2+ ion is present in tetrahedral void. So it is coordination number is = 4.
Similarly S 2– ion have coordination number = 4.
As Zn 2+ ion is present in tetrahedral void that's why line's connecting any two nearest neighbour and Zn 2+ have angle = 109º28'.
For tetrahedral voids radius ratio is 
= 0.225.
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