Physics of Non Crystalline Solids
Proceedings of the 5th International Conference / Physique des Solides Non Cristallins
Comptes rendus du 5ème Congrès International

J. Phys. Colloques 43 (1982) C9-307-C9-310
DOI: 10.1051/jphyscol:1982956

BOND ORDERING IN NONCRYSTALLINE SOLIDS

A. G. Revesz

COMSAT Laboratories, Clarksburg, MD 20871, U.S.A.

Résumé
A partir de l'analyse des propriétés optiques des solides non cristallins (nc) et des solides cristallins correspondant avec des liaisons à caractère covalentiel prédominant, on obtient un paramètre d'ordre F. Ce paramètre détecte les différences entre les solides nc caractérisés par un ordre à courte distance semblable p. ex. Si amorphe (F ≤ 0,8) et silice vitreuse, SiO₂ (F ≈ 1). Les propriétés optiques et électroniques indiquent que, contrairement aux solides amorphes, dans les solides vitreux, les états électroniques peuvent demeurer délocalisés même s'il n'y a pas d'ordre à longue distance.

Abstract
From the analysis of optical properties of noncrystalline (nc) and the corresponding crystalline solids with predominantly covalent bonds a bonding order parameter, F, is derived. This parameter reveals differences between nc solids which are characterized by similar degree of short-range-order as, e.g., amorphous Si (F ≤ 0.8) and vitreous SiO₂ (F ≈ 1). Both the optical and electrical properties indicate that, in contrast to amorphous solids, the electronic states in vitreous solids may remain delocalized even though there is no long-range-order.

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