J. Phys. France 39, 671-688 (1978)
DOI: 10.1051/jphys:01978003906067100

On the cohesion of covalent structures of elements in condensed phases. II. - corrections to a simple Hückel approximation due to coulomb interactions between valence electrons

J. Friedel

Laboratoire de Physique des Solides, Université Paris Sud, 91405 Orsay, France

Abstract
Corrections due to Coulomb and exchange interactions between valence electrons reduce cohesion, without altering much the relative stability of the various phases. The dipolar interactions between saturated sp3 dangling bonds stabilize the corrugated layers and the helical chains observed for penta and hexavalent elements respectively.

Résumé
Les corrections dues aux interactions de Coulomb et d'échange entre électrons de valence réduisent la cohésion, sans changer beaucoup la stabilité relative des diverses phases. Les interactions dipolaires entre liaisons pendantes sp3 saturées stabilisent les couches ondulées et les chaînes hélico dales observées pour les éléments penta et hexavalents respectivement.

PACS
6125 - Studies of specific liquid structures.
6141 - Polymers, elastomers, and plastics.
6150L - Crystal binding; cohesive energy.

Key words
bonds chemical -- crystal binding -- elements chemical -- exchange interactions electron -- HMO calculations -- LCAO calculations -- liquid structure -- noncrystalline state structure -- tight binding calculations