Effective potentials for 6-coordinated boron: Structural geometry approach
Department of Physics, Cornell University - Ithaca NY 14853-2501, USA
Accepted: 22 May 2000
We have built a database of ab initio total energies for elemental boron in over 60 hypothetical crystal structures of varying coordination Z, such that every atom is equivalent. Fitting to each subset with a particular Z, we extract a classical effective potential, written as a sum over coordination shells and dominated by three-atom (bond angle dependent) terms. In the case Z=6 (lowest in energy and most relevant), the classical potential has a typical error of 0.1 eV/atom, and favors the “inverted-umbrella” environment seen in real boron.
PACS: 34.20.Cf – Interatomic potentials and forces / 61.50.Lt – Crystal binding; cohesive energy / 71.20.Mq – Elemental semiconductors
© EDP Sciences, 2000