ZnS (zinc blende): S^2- in FCC, Zn^2+ in alternate tetrahedral voids (half of 8 = 4). Z = 4, CN 4:4. Face diagonal contains the relationship: a*sqrt(3)/4 = r+ + r-. Examples: ZnS, CuCl, SiC. CaF2 (fluorite): Ca^2+ FCC, F- in ALL tetrahedral voids (8). Z = 4 CaF2, CN Ca^2+ = 8, F- = 4. Antifluorite (Na2O): O^2- FCC, Na+ in all tetrahedral voids.
Part of JPC-09 — Solid State: Unit Cell, Packing & Defects
ZnS and Fluorite Structures
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