The crystal lattice with alternate tetrahedral voids occupied is ZnS (Blend).




- In a crystal lattice, the constituent atoms are arranged in a highly ordered repeating pattern.
- The crystal lattice structure is determined by the arrangement of atoms or ions in the crystal.


- Tetrahedral voids are the spaces or cavities formed between the constituent atoms or ions in a crystal lattice.
- These voids are in the shape of a tetrahedron and are located at the centers of the tetrahedral arrangement of atoms or ions.


- In some crystal lattices, the tetrahedral voids may be occupied by atoms or ions.
- The occupation of tetrahedral voids can affect the physical and chemical properties of the crystal.


- In the NaCl crystal lattice, the sodium (Na+) ions occupy the octahedral voids, and the chloride (Cl-) ions occupy the alternate octahedral voids.
- The tetrahedral voids in NaCl are not occupied.


- In the ZnS crystal lattice, the zinc (Zn2+) ions occupy the alternate tetrahedral voids, and the sulfur (S2-) ions occupy the face-centered cubic lattice sites.
- The occupation of alternate tetrahedral voids by zinc ions gives the ZnS crystal lattice a blended structure.


- In the CaF2 crystal lattice, the calcium (Ca2+) ions occupy the face-centered cubic lattice sites, and the fluoride (F-) ions occupy the tetrahedral voids.
- The tetrahedral voids in CaF2 are occupied by fluoride ions.


- In the Na2O crystal lattice, the sodium (Na+) ions occupy the face-centered cubic lattice sites, and the oxide (O2-) ions occupy the octahedral voids.
- The octahedral voids in Na2O are occupied by oxide ions.

Therefore, the crystal lattice in which alternate tetrahedral voids are occupied is ZnS (Blend).