The resonance aspect of chemical bonding is extended to solids with particular emphasis on its consequences for structural and vibrational properties. It is shown, for example, that the square of the infrared effective charge is proportional to the high-frequency dielectric constant in resonance-bonded systems. The IV-VI compounds and the group-VI elements are shown to exhibit the features of such resonance bonding. The dependence of resonance bonding on long-range order is discussed with respect to differences in the properties of the amorphous and crystalline phases of these materials.

• Received 30 November 1972

DOI:https://doi.org/10.1103/PhysRevB.8.660