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The Solid State

Short Answer Type

41. Define non-stiochiometry defect in crystals?

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42. What is the arrangement of Zn²⁺ and S^2– ions in Zinc blende (ZnS) crystal structure?

Zinc sulfide crystallizes in a Face-Centered Cubic unit cell (FCC) having an edge length of 5.409 Angstroms
Sulfide anions have FOUR neighbors of opposite charge arranged at vertices of a tetrahedron. Zinc cations also have FOUR neighbors of opposite charge arrange at vertices of a tetrahedron. So the Zn : S coordination ratio is 4 : 4 or 1 : 1.

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