A simple model is proposed for the static electronic dielectric constants of zinc-blende and wurtzite crystals in terms of the dielectric constants of diamond-type crystals. The model suggests a natural definition of electronegativity in ($s{p}^3$)-hybridized valence states.

• Received 7 December 1967

DOI:https://doi.org/10.1103/PhysRevLett.20.550