Solid StateHard

Question

Diamond structure can be considered as ZnS (Zinc blend) structure in which Zn2+ in alternate tetrahedral void and S2- in cubic close pack arrangement is replaced by carbon atoms. If C - C covalent bond length in diamond is 1.5 , what is the edge length of diamond unit cell (z = 8) :

Options

A.3.46
B.6.92
C.1.73
D.3

Solution

4x = √3a ⇒ = x
⇒ = 2 × = 2 × √3 = 1.73 × = 3.46

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